Probably not addressed because that's the game's intended function. Probably because fighting is more straight-forward than in say, WoW, where most instance/raid bosses have gimmicky fights where you jump/move/etc. at a given interval. Using XI as an example, very few fights ever required you to move (sans kiting) with a few exceptions like colossal blow or throat stab, which could be avoided, but you had to really watch for them. Even so, those moves were both aggro-reset, so in the grand-scheme of things, they really weren't intended to be avoided, were they?