This is SUCH a delicious post. Oh my god this will be fun.
Sheik didn't necessarily deserve to take a stock from Marth in the first place. Like I said, always assume that the platform will come up.
Sheik didn't deserve to take the stock? F-air gimps happen... all it takes is for Sheik to read a double jump from Marth. I don't see how you can get away with saying Sheik didn't deserve to take the stock. If this happened on Battlefield, and Marth didn't have that random chance of being saved, would you say then that Sheik didn't deserve the stock? Put another way,
who are you to say what Sheik DESERVES?
Sheik can assume that the platform will show up. She can do so and react perfectly if it does. What can she do? She can probably f-air/b-air again? Let's say she even gets the hit in before Marth is able to shield.
It doesn't matter. Yes, Sheik gets another hit in and that's great. However, now Marth has his double jump and up-b back, and Sheik is not guaranteed to hit him out of his double jump again by any means. Marth went from a position where he was definitely going to die to a position where it was very likely he would recover. What determines whether he would be able to get into that position? Random chance.
You're missing the other side of the scenario here. Yes, you can say the Sheik should know that the platform could come up, and should accept that the stage can save her opponent in that position. Absolutely. However, since you insist on looking at whether it can affect the match, consider the scenario where Marth is saved, and the scenario where Marth is left to die and ask yourself:
what separates these two situations?
Players assuming that the platform will rise does not mitigate the effects of randomness completely. Let's say this scenario plays out. Marth gets hit out of his double jump by Sheik's f-air and will be ledgehogged by Sheik if he goes for the ledge. He up-b's, and aims to fall where the platform will rise. I pause the replay here. Now let me ask you this: will Marth lose his stock? You won't be able to answer. This is, without a doubt, randomness affecting a match.
The difference between a character being saved and a character being KO'd/damaged is also different. If Marth was saved by the platform, both players still have multiple options from there and it just turns into a "reset" of sorts. If a player is KO'd, etc..., they lose all of their options. It's the difference between a major advantage that will affect results, and a minor advantage that could maybe possibly slightly affect results.
How can you in one post say this:
I see no objective difference in forcing players to not use a powerful defensive option that (arguably) breaks a stage (Pirate Ship) and not using a powerful offensive option that breaks a stage (WarioWare).
...and then in the next post say this?
The difference between a character being saved and a character being KO'd/damaged is also different.
What is the
objective difference, when in the end
whether a stock is lost is determined completely by chance? What is the
objective difference between you having your stock taken away from you and your opponent having his stock returned to him? Why is it okay just because both players have options after the platform pops up? You are looking at this in the wrong way. Marth is GIVEN options. GIVEN. He goes from free-falling to his death to landing on a platform, and he is magically granted these options, and his stock, just because the stage decided that it would be a good idea to have the ghost pop up at that point in space and time.
"Maybe possibly slightly affecting" results? Are you serious? This is a STOCK DIFFERENCE. That's one third of the match. If your opponent is saved at low percents, that is a significant shift.
The randomness being restricted to two locations means that it is plausible for players to react to the randomness. That's all.
Being able to react doesn't change the fact that the outcome of a match was potentially swayed. Stocks can still be returned even if you react perfectly, as shown in the Sheik-Marth example.
It's impractical because if you plan around one random event, another could screw you over.
Say you want to avoid the diagonal line, so you recover high instead (you're Meta Knight) suddenly the side-spikes appear (with the hit-box appearing before the animation, for some reason >_>) and you get KO'd. Alternatively, MK could have gone diagonally-high to the stage... and risk having one of the spikes from the spike pit (not sure what it's called, the one where spikes are placed along the stage and are walls) hit him and KO him... So lets say he recovers a little higher than that, OH NO! one of the fireballs appeared, the opponent waits for him to DI out and KOs him. Now imagine all of that... with a player pressuring your recovery as well.
What I'm trying to say is: Trying to prepare for everything on Pictochat takes away a LARGE amount of your options to the point where results could be affected purely due to randomness. Yoshi's Island, doesn't.
I'll have to rethink this part. Not a whole lot of thought went into the original point.
Also, I don't believe a ruleset can be created completely objectively. I just try to stay as objective as possible in situations where I can. Obviously, it's impossible to play the game with no randomness and playing the game with nothing banned for randomness is uncompetitive, so I have to take a subjective stance.
Yes, but your stances contradict each other.
The only criteria for randomness we need to look at it is "Will this effect results at the highest achievable level of play?" You're making it sounds a lot harder than it actually is imo.
Oh man... I WISH that was what we were looking for, but it is most certainly not. This criterion would DEFINITELY see Yoshi's Island banned along with Pictochat. Frigate Orpheon would probably have to go as well, unless Olimar were banned from CP'ing it.