Right now there's only different color for transition phase, which i don't really care that much about. But when someone actually overaggroes you gotta see that and react immediately

When someone pulls from you the nameplate should revert to whatever the normal colour is. Assuming you have tank mode on, that should usually be noticable, no?

Well no, normal color is not noticeable. And to clarify, this is about dealing with skittish, not some tank swaps in raids. In a large pack you can't keep track of which one is transitioning or not