I understand that sith raid is new and the focus of the game’s most adamant players, I participate in it as well. But every guild is either doing tank or working on doing tank too. Tank is arg...
Literally just announced in newest announcement that haat/aat is having some challenge gear removed. So no. Challenge gear isn't only being removed from sith raid.
Edit: in case you missed it https://forums.galaxy-of-heroes.starwars.ea.com/discussion/179143/upcoming-sith-raid-changes#latest