Well, then it's your fault for doing that content when it was current, instead of waiting 11+ years and then doing it when an alternative, much easier way to get the rewards are implemented.
Dude, you'd have a point to complain if this change was implemented way back in Cataclysm. But after over ten years? You have no right to complain or be mad that they're doing this. Those gems aren't even useful anymore.