New fag here, I dont watch her clips, only observing what people says about her: she's either the worst, most overhyped vtuber or the best one single handedly building Hololive depending on who you ask and there are no inbetween.
That being said, saying that newfans doesnt know about her is only true for EN. Her effects are definitely fell across the JP tubers with how much they loved her.
E.g. Polka dedicated this cover to her and it's actually what turned me into oshi-ing polka from originally an EN watcher. Easily one of the best vtuber covers, I will fight people for it. Better than the original. Sora/Astel also also did a great cover of this but they don't stand a chance.
Or shit like this
I consumed so much media mentioning coco without hearing her talking
The most influential and confirmed thing that Coco did for Holo was getting rid of all business chances in China: if that its something bad or good its up to each individual
There are some Holomem that want to play Chinese games, new fans wonder why they cant do X thing with chinese companies and ALL of their competitors get chinese sponsors that Cover used to get
But there are others members that dont care about any of that Chinese stuff and some fans are glad that Coco saved us from Gachashit