And what current "norm" is all detriments and no benefits. Valid arguments, but only upto a point i think.
Yes, recasting vtuber is impossible, and this is exact reason why ever corpo must strive to make their performers job and life as confortable as they could, sparing no expense.
Model etc is investment indeed, but, like many investments, there are no guarantees that it'll pay off at all, this is known risk. And it's very small investment too, especially compared to profit margins.
Main problem is, corpos hold way too much power over their employees, especially foreign corpo. Some balancing is necessary. If talent have guaranteed right of acknowledgement, corpo have incentive to treat them better, they can't so easily gaslight talents about "you are nobody without us".