Lawrencelot
Smash Lord
Using the keyboard has advantages and disadvantages. The most obvious and maybe sole advantage is DI (aside from that a keyboard is already on your computer and you don't need to install things). Disadvantage is that some basic techniques are not possible, or require another move to be done first. I want to discuss how big these advantages and disadvantages are, because I think the difference with a controller is smaller than most people think.
I use keyboard for over 2 years now. A few weeks ago I played this game on a wii with a gamecube controller, that was the first time I played this game with a controller. First I had to get used to the controls (which didn't take long as they were melee controls), but I quickly noticed something. While being edgeguarded, I DI-ed into the wall like I do on keyboard, but I didn't even think while doing it. As far as I know I didn't even perform a slide DI, I probably just holded my control stick (diagonally) towards the wall like I do in melee (on purpose or not). While online controller users call this something like hax if I do it consistently on keyboard, I also did it consistently on controller without any effort at all. So I think this type of DI is not a big advantage for keyboard.
Then there's DI out of drills. I didn't really try it a lot on the console, but without too much effort I think I got half the DI I'd get on keyboard. So this is probably the major advantage for keyboard players: getting out of drills quickly. But still, I think it is possible to do the same with a controller, it only takes some more effort. And a lot of players do not do anything to prevent this DI: in most cases, like pika's fair and samus's upB, you can follow the DI to limit it's effectiveness.
Then the disadvantages: 1 basic technique that can't be done is 'walk'. Because dashdancing exists, walking isn't that useful for spacing in this game as it is in for example Brawl. One of the most important things walking is used for is to chain uptilts. Obviously, this is also no problem on keyboard because IF you manage to do an uptilt, you can just go left or right immediately after the uptilt and you'll walk. Since your reaction time takes less than the duration of an uptilt (hopefully) this shouldn't be a problem. Right now I can't really think of other great uses for walking, maybe for spacing a downsmash or a tilt, but if you shorthop or even full hop enough you can plan your walk after you land on the ground, with a canceled aerial or not. Both upsmash and sidesmash can be done while running, though sidesmash requires a dashdance/pivot/whatever you call it.
Tilts. Downtilt is no problem. Again, a sidetilt or uptilt can be done easily after a canceled shorthop aerial. It all requires a bit of planning, but doing a sidetilt out of the blue is rarely a good option anyway. Doing an uptilt out of the blue is often effective, however. This can be solved by getting used to always holding up if you do nothing. If you never do nothing, this is no issue.
Obviously, instead of a shorthop aerial you can also decide to grab, empty shorthop, jab, do a b move, dash attack, etc. into a tilt or walk. A player who is never doing nothing should have no problem with the keyboard disadvantage of no walking/tilting out of the blue.
Then there's the fact that you only have 8 directions (though I've heard a rumour that it's possible to have more on kb). This is a real disadvantage for Fox, it is needed for the upB. Pika also suffers from this, but not as much because his recovery is ... anyway. I've never had a problem with Ness's upB though, I don't think having more than 8 directions for this move is crucial.
Maybe I forgot more things, but it's kinda late and I wrote this post at once so bare with me. Anyway, I think that using a keyboard isn't any more 'fake smash' than using a controller on an emulator is. I have almost zero experience with controller for this game so I might be wrong, but then I'll hear that in this topic.
I use keyboard for over 2 years now. A few weeks ago I played this game on a wii with a gamecube controller, that was the first time I played this game with a controller. First I had to get used to the controls (which didn't take long as they were melee controls), but I quickly noticed something. While being edgeguarded, I DI-ed into the wall like I do on keyboard, but I didn't even think while doing it. As far as I know I didn't even perform a slide DI, I probably just holded my control stick (diagonally) towards the wall like I do in melee (on purpose or not). While online controller users call this something like hax if I do it consistently on keyboard, I also did it consistently on controller without any effort at all. So I think this type of DI is not a big advantage for keyboard.
Then there's DI out of drills. I didn't really try it a lot on the console, but without too much effort I think I got half the DI I'd get on keyboard. So this is probably the major advantage for keyboard players: getting out of drills quickly. But still, I think it is possible to do the same with a controller, it only takes some more effort. And a lot of players do not do anything to prevent this DI: in most cases, like pika's fair and samus's upB, you can follow the DI to limit it's effectiveness.
Then the disadvantages: 1 basic technique that can't be done is 'walk'. Because dashdancing exists, walking isn't that useful for spacing in this game as it is in for example Brawl. One of the most important things walking is used for is to chain uptilts. Obviously, this is also no problem on keyboard because IF you manage to do an uptilt, you can just go left or right immediately after the uptilt and you'll walk. Since your reaction time takes less than the duration of an uptilt (hopefully) this shouldn't be a problem. Right now I can't really think of other great uses for walking, maybe for spacing a downsmash or a tilt, but if you shorthop or even full hop enough you can plan your walk after you land on the ground, with a canceled aerial or not. Both upsmash and sidesmash can be done while running, though sidesmash requires a dashdance/pivot/whatever you call it.
Tilts. Downtilt is no problem. Again, a sidetilt or uptilt can be done easily after a canceled shorthop aerial. It all requires a bit of planning, but doing a sidetilt out of the blue is rarely a good option anyway. Doing an uptilt out of the blue is often effective, however. This can be solved by getting used to always holding up if you do nothing. If you never do nothing, this is no issue.
Obviously, instead of a shorthop aerial you can also decide to grab, empty shorthop, jab, do a b move, dash attack, etc. into a tilt or walk. A player who is never doing nothing should have no problem with the keyboard disadvantage of no walking/tilting out of the blue.
Then there's the fact that you only have 8 directions (though I've heard a rumour that it's possible to have more on kb). This is a real disadvantage for Fox, it is needed for the upB. Pika also suffers from this, but not as much because his recovery is ... anyway. I've never had a problem with Ness's upB though, I don't think having more than 8 directions for this move is crucial.
Maybe I forgot more things, but it's kinda late and I wrote this post at once so bare with me. Anyway, I think that using a keyboard isn't any more 'fake smash' than using a controller on an emulator is. I have almost zero experience with controller for this game so I might be wrong, but then I'll hear that in this topic.