Personally, I don't mind if new games aren't like Melee, if they offered NEW ways to play that were deep that were not like Melee. For example, if Brawl took out all those techniques, they should have added more moves. Each character should have had more moves, or there should have been new interesting gameplay innovations. Instead, Brawl offered tripping and crazy overpowered Smash Balls as new gameplay mechanics. To use an analogy to Zelda as I've seen in this thread, Wind Waker doesn't have Epona, but instead gives you Sailing. If they included Epona but made Epona slower and made her jumps slower, that would seam lame compared to OOT. By drastically changing Epona to a boat, the game creates it's own identity.
I mean, what did Smash4 do that was new? Edge trumping is the ONLY thing I can think of, which was a cool, simple way to add innovative ways to play. The problem with the post Melee Smash games is that they didn't add real new ways to play the game. They just added more content , quantity, and didn't change the core gameplay elements. That has been my problem with new post Melee games. They removed interesting ways to play the game, but didn't add new ones. They could have added air throws,eor give enough an extra set of B moves in the air. Or how about Back Smash is different from forward smash? How about picking two characters and switching like Marvel vs Capcom? There are many ways to keeping button inputs simple and straitforward, but at the same time innovating - but instead, features are only removed, and nothing is innovated.
As a result, the post Melee games all are too similar to Melee, minus what Melee so well liked, instead of striving to be their own game by actually innovaitng the core gameplay elements of Smash. I think if the core elements were changed drastically that they no longer even resemble Melee but they still are accessible to new players the way Sakurai wants, I think Melee players would actually give the game a shot. For example. the perfect shielding innovation in Ultimate is a totally new concept, and Melee players are actually excited about it because it's completely different. It appears to be a deeper way to play the game, and it doesn't require insane button inputs. More of this kind of thing really has been needed.