I think a paint/dye system takes away because everything would look so random, you’d never really know what anyone is carrying at a glance. As it stands now, at least in the loading screen, you can tell what pieces you have and if your running a good PC you can also tell what other people have, making collecting the really cool stuff that much more important.
If I could just colour my stuff to look cool instead of going out to get the cool things, maybe it wouldn’t matter to me?? who knows, that’s just a random thought; I like that tabards exist to create difference, but I don’t really like the idea of colouring armor however you want. In my opinion it takes away more than it gives, and every PVP character will be running a form of black/camo.
I’m not totally against the idea, I’m just not sure if I like it. Sorry for the late reply, it came up in google when I looked up if you can dye armor in WoW.