There is something I said about Ultimate not being a good follow up to the days of the Smash Ballot, but that was seemingly ignored and looked over, so I would like to go into more detail on that, if you don’t mind.
You see, as I said before, there were more humanoid characters and echoes (and a semi-clone) than those with original movesets and non-humanoid physiques, all in the base game. That said, the fact that “Everyone is Here” was a priority make it harder to use time and resources for not only more single player modes, but more original characters. I mean, Dixie Kong would likely have her own moveset rather than be a clone or echo, even though she could have been modeled after Diddy to an extent. Bandana Waddle Dee was non-humanoid, and I think it would have taken some significant time (not more than other characters, but still) to develop Bandana Waddle Dee and make a moveset for him. Then there’s Waluigi, who has a slender build that would probably be needed to be built from the ground up, not that it is a problem, but since he was an Assist Trophy in the past few games, it might have been easier to put him in that way, especially since he may have not been that much of a priority. There is also Isaac from Golden Sun, whose moveset might as well be wholly original, which the devs of Smash Bros. Ultimate did not have time for with the “Everyone is Here” thing.
And that is not counting the DLC, for while there were Banjo and Kazooie as well as Sora, both playable characters who all did well on the ballot and were second most voted and first most voted respectively, Banjo and Kazooie were technically humanoid, at least Banjo was, but they were a tag team character, so I don’t imagine that they were as easy to make as a normal, humanoid character. As for Sora, Sora basically was not going to be in Fighters Pass Two initially, from what I have read, until Sakurai met with those Disney reps. That said, it was said that Nintendo chose the DLC characters, so I don’t know how much control Sakurai had over that area. Even then, most of the characters that were DLC in Smash Bros. Ultimate were human/humanoid, so they were easier to work with.
But anyway, Ultimate was all after when the Ballot took place during Smash Bors. 4’s DLC period, and though many were wanted on that Ballot, Ultimate itself had focused on “Everyone is Here” as requested to Sakurai as last wish from Iwata, if I recall correctly. Point is, doing “Everyone is Here” for Ultimate took a lot of time and resources, so with fewer new characters in especially the base game, I personally don’t think Ultimate was the best way to follow up on the Ballot, especially in terms of adding more characters requested from the Ballot in the game that was created AFTER the ballot was finished.