When will the Heretics get more armor??

Let me say, I have no problem with the classes being locked to the legions - I'm a lore nerd and the choices made sense to me. You'll never see a World Eater sniper.

But why are we stuck to one armor set? When I see fanart of each of these legions, there are plenty of ideas to draw from. Only changing the colors is such horseshit when Chaos allows for warp mutations, gory ornaments and Heresy-era armor