If voice actors are represented by the same union as all the film and TV actors then they never had a chance. United Airlines had a similar situation in the 90’s where flight dispatchers were represented by the same union as the mechanics - but were outnumbered probably 10 to 1. So dispatch pay and working conditions were an afterthought to the union and even if every dispatcher voted no, if a contract was good to the mechanics it would still pass.

That’s interesting you say that because building nuclear plants is also a “bloody nightmare”, see Vogtle, Hinkley Point, Flamanville, etc