Except you won't limit it to just abilities. In fact, these exceptions shouldn't have happened in the first place. Eventually some idiot will come along and propose complex bans on moves and items for the sake of balance like you are right now with abilities. You act as if you can draw a line here but you simply can't, and you're demonstrating this right now perfectly.
And then people will say "hell no, the Speed Boost Blaziken ban was enough, now this is just crazy", in the hypothetical situation where Blaze Blaziken comes back and some idiot comes along.