Other vtubers who wanted to "move on" did exactly that, they moved on. Nimi didn't because she's a normalfag leeching grifter who never should have been in hololive, no different from whores like Sinder.

People sometimes think that all mumei had going for her was being a cute girl but mumei
-sang so much it fucked up her throat
-is an actual trained singer/has a good voice
-funny
-listens to a lot of asmr because it calms her, did some herself because her chat liked it
-actually liked her chat
-actually tried to learn japanese to communicate with JPs, instead of trying to leech watame poorly like fauna
-people genuinely liked her, girls poured into her streams, Towa was sad to see her go
-actually good at game
-ponytails are the best, so is brown hair
-great at zatsu, fun times
-you were alone at 3 AM and can't sleep well here's mumei with a karaoke
-likes american dad, a good show
-had the decency and grace to do a new thing with her life instead of milking her old rep

Nimi is even worse than Ame "improve yourself" because she didn't do a single fucking thing. Her only and one claim to fame was consistently speaking in that fake ass whisper voice, while sucking at asmr (she stole it from Shondo anyway) and dumping her friends whenever they were no longer leechable.

The entire arc of the last 12 months has been nimi evolving into the Legendary Super Grifterjin- she made 500k after tax from announcing her graduation from all the people sending 'last supas' or buying her last-chance merch, she made another 500k by then releasing more merch on day 1 as nimi and grifting as hard as possible. She is now talking about her husband while sucking up to Ironlung in an attempt to get in on the Twitchfag "couples" audience, which actually exists- Ironmouse is the best example- which is why Nimi is specifically trying to tongue pink cancer girl's puckered butthole, because nimi smells a big grifter opportunity doing a virtual wedding and selling tickets to all the twitchfags who want to see her get e-married or something. It is all a coldly calculated, deliberate process of milking people for as much as she can and only schizo faggots would disagree when the cold hard cash stats are right there.

She IS a bad person, and anyone demanding you be 'happy' for someone is a toxic jackass, even ignoring all the other circumstances.