Sadly, it seems they tried to copy S too much.
S was well done, it did copy the "Rainbow Crystal" style targeting of humans, but it was the first season to go heavy on that...this should have stopped after the talismans were found, in my opinion. It made Mimete seem redundant.
SuperS doubled down on it hard and I still think that's one of the main reasons it felt so stale. I don't even really blame them, though. It was getting hard to stretch this kind of breakneck story over nearly 40 episodes.
Then Stars...ugh.
I still love it all, I just wish they'd mixed things up a bit or at least made it seem more probable that one of the other hearts/mirrors/star seed hosts were the real thing and had some more fighting vs bonding with randos we'd never see again.