This just seems a bit stupid to me but why should they remove the whole achievement if it's only 5s being removed? Can't they simple just make any 5s related achievements FoS's and leave The Arena Master there? It gave people incentive to work to 2200 I don't see why they should announce its removal so close to Legion (Barely giving anyone time to push for it now) and remove it in the first place?
Thoughts on this?