Surely, the devs look through commonly used plugins and third party tools and look through places like Balance discord to track these sorts of things? I sincerely doubt they dont know about this issue, and if they dont...thats not a good sign of their awareness of the community and how people play the game.

That said, I hope they see this and fix it. People shouldnt be using third party tools to level the playing field. Incidentally, in addition to ping affecting animation lock, your FPS also changes your effective GCD...and as such third party tools exist to fix your FPS at a level that shortens your GCD the most. Outside of extreme cases, players SHOULD NOT have an insurmountable gameplay advantage by having a more expensive graphics card or living closer to the server, especially when both can and are fixed by third party tools.