My only "problem" with some people who are clamouring for every Super character under the sun is the fact that there are characters who are basically legacy characters who deserve to be in a game that is looking to be one of the most faithful to the original material just as much as the brand new, shiny characters who have been introduced in the past couple of months.
It's like if Arc System Works was going to make a Star Wars game, and people kept posting that every major and minor character from TFA, RO and TLJ should be the priority over ones from the original films, just because they're the new thing.
I don't mind if Super characters make it in, and I'd be happy for a load of them, as it'll mean a bigger and more varied roster, but I don't think it's really unfair for people to want characters they've known for decades now to finally have their time to shine.
Obviously, the whole "ha ha it's another Z character" thing is childish, but so does the "another irrelevant Z character, the roster sucks".