Hmm, not really. I would argue that just always adding whoever the fandom feels like shoving down everyone's throats at the time would make the roster selection boring and predictable.
For people like me who are in the camp of "I'm fine with the roster and don't mind whoever newcomer makes it in at this point", I have no problems if they decide to add a Pokemon from the new generation or a Mario character. It doesn't really stifle creativity and diversity as people wants us to believe. Like, nothing about Piranha Plant screams uncreative or less diverse. Or Incineroar's luchador motif. As shown with the plant's reveal, people actually get angry when the devs exercise their creative freedom. Its quite a contradiction.
At this point, since we are past the "surprising but not completely unexpected" reveals like Ridley, Dark Samus and K. Rool, I rather be surprised with the new characters like I was with the plant and Joker, who I know nothing about.
More creative options aka your most wanted ones. People never realize their own irony.
When you are biased against something, everything else becomes a 100 times more desirable. Even if their moveset hasn't been thought out and implemented yet, somehow you know that they are much more creative and appealing.
I explained this before: It's less about newcomers being shoved down our throats and more about seeing the fighter for the first time. When I saw incineroar, I was more on the side of "Oh look, there's our obligatory pokemon," and less "Wow! A fighter they must have chosen from ground up!" It would have been nicer to get a newcomer that wasn't more or less shoehorned in.
I feel like another newcomer we could have done without was Isabelle, and I don't really need to explain this one. Her character isn't the type that fights at all to begin with, and half of her moves are ripped from villager. The only reason I pick her instead of villager is for the occasional meme.
Personally I think that Chrom, Daisy, and RIchter weren't that necessary. Daisy and Richter are basically reskins of the fighter they're echoing (I know Dark Samus is too but it's nice to see more than two Metroid characters as fighters) and Chrom is a clone of a clone, raising our Marth count to four.
To put it simply I feel like they had better options than the newcomers we got. There were a lot of newcomers who were just unnecessary clones and/or shoehorned in. And I'm not talking about fighters I personally want, that would be hypocritical. There were dozens of newcomer options, and only a few of them I wanted in (most of my newcomer wants had pretty low chances of getting in anyway).
