Eh, elite sets are the one thing I think should remain locked. Reason being is because Rated PvP is one of the only places in the game where you’re progress hinges on actually winning, not just participating or simply playing.
In PvE you can fail 10 keys all week and get mythic level gear and set appearances. Take as long as you want, die as much as you want etc. You’ll still get your rewards
PvP though if you aren’t winning, you’re actively going backwards and losing rating.