CrVI is carcinogenic. On the one hand, it is very dangerous to work with it because of the gases that are produced when chromium is separated from the liquid, and on the other hand, skin contact is very dangerous. In addition, CrVI is not good for the environment and the chemical compound is difficult to destroy to make it non-toxic.
it is not "new". In europe they talk about it since 20 years but there was never an alternative. However, since there is now an alternative, it is insisted that it be applied.
That's just about what's going on in Europe right now. Possibly the same in the US?