Several years ago, a colleague said to me that he'd rumbled me, that I wasn't stupid after all, I was just pretending to be stupid!
Which was true ... to a certain extent, depending on the situation.
I didn't know the name for it until a couple of years ago but I deliberately practice what is known as Socratic Irony, or "being like that detective Columbo from the TV":
My boss does the same. He's often 2 or 3 or 4 steps ahead of me, but he blatantly (and transparently) pretends not to be so that I have to figure out (what he already knows) myself.
It's a useful way of helping other people think on their feet, which is important because they understand why they're doing something, rather than just doing it because X told them to.
It's also handy, for me, because, often, I really don't know what the answer is. I often know the principle or general-direction of the answer (the Why and the What) but not the how.
The difficult thing with this approach is that it's very, very difficult to not just say "do this!". Very difficult. Plus, if you're in an "expert" role, you're giving away a lot of your secrets and - if it bothers you - your power. And, it's an approach that can sometimes antagonise other people immensely.
This "Socratic Irony" approach suits my personality, I think, but use it with care: Socrates was poisoned, eventually.