See what I was saying about one-off tricks? He could have used that against M-11 in his recent Agents of Atlas appearance, for example. I absolutely love that it didn't work, though; EMPs are like the #1 most overused writing crutch when somebody wants to have a non-powered character defeat Iron Man.
And it's done in such a way that other writers can still use it to depower Iron Man if they need to.