I'm looking for a story where Rhodey explains that Whoever pilots the Ironman/Warmachine suit needs to be really smart.
He says that even for him, with an engineering(?) degree from a top level university, catching up with all the information needed to pilot the inferior suit, is sometimes difficult. And that the Ironman suit could only be piloted by Tony Stark. That Tony Stark is Ironman.
I'm sure I read it on AO3 under the "team ironman" tag, but I can't find it.
Found! Thank you.
PS If there are other stories showing not just anyone could pilot the suit, I would like to know.