It's okay, I was guilty of it too. That is until I decided to reinvest all the autism and assburgers I spent on fixing RWBY into working my own thing.
I admit I was also tempted, and it's difficult to resist given that Mounty did lay the foundations of what could've been an amazing show that could've matched top tier anime, ultimately I arrived at the same conclusion. Although RWBY is still printing a lot of money, it never reached it's true potential so I can see why people are trying to do fix it.
And, as much as he denies it to avoid the stigma of "trying to fix Rwby" that's basically what RWBY Cherish is, an attempt to fix that mess.
IMHO, Any competent writer that is good enough to fix it is good enough to do something original on their own, so unless they are doing it for fun or maybe to promote themselves, they would be better spending their time doing exactly that. Because, to be honest, fixing it properly would be basically a full-time writing job.
In an ideal world Rooster, Teeth should be paying a professional writer to reboot it or at least fix what's already there, instead of fans doing it for free.
Cinder having a cosplay slut for a VA is part of what makes her a weak villain yeah. She can only only do "smug and slutty" and "edgelady."
I suspect the only reason Nigri got the job was that someone on the crew had a crush on her and just wanted an excuse to try to date her
There's little reason to have her otherwise, she isn't that famous, outside of the cosplay/weeb circles to keep her for "star power" and she even disappeared a whole season for some reason, and she isn't that skilled as a VA. I mean yeah she is big in her niche, but in the grand scope of things, she isn't that big to choose her over an actual professional voice actress.
At least the others have the excuse that they were the only people available within their budget. But her? knowing her type I sincerely doubt she is doing this cheap enough to justify the expense.