Would you say Robin and Corrin don't bring something new to Smash? Yes, the 3 clones are kinda stupid, but that's mainly due to how Smash Ultimate is working, and not because Sakurai thinks they deserve more reps. It may have been explained before, but FE has a different cast every game with a few exceptions, and that means we should normally have changing reps every Smash game, but Everyone is Here, so all the FE reps come back, plus Chrom, who was highly requested by Japanese fans.
Wow. You don't actually know how the game works, so you're just insulting the fans. Whatever.
5 MILLION people playing, FE:H isn't niche. Corrin is despised because he's a terrible character from what is considered one of the worst games in the series story-wise. Fire Emblem isn't a huge series, but Splatoon is the hot new thing in Nintendo. OF COURSE it would outsell most things, hell, it outsold Kirby: Star Allies. Yes, 7 reps is too much for the series, but that's just how it turned out because "Everyone is Here". FE does deserve 4 reps, and we have 4 unique characters:
ultcorrin:. The rest are echoes or semiclones, and I'm OK with that. That's how FE works.