You mean like they aren't going to give us, say, different loot options, because we already have a loot system in place?
Then you're among the people who could just opt to keep your <se.#> sounds enabled. I, for one, don't need a sound to tell me the tank provoked, because I just go by the visual of their animation. And not all tanks use Provoke macros to begin with, so relying on them isn't going to yield perfect results.
Having the OPTION to disable them doesn't mean you can't keep everything as it is now if you so desire.