That’s definitely the time when wild ideas about the multiverse and crazy guest stars can be bandied about between writers and producers.
Not that all of those ideas eventually come to fruition, of course, which is the case with the possibility of Aaron Taylor-Johnson returning for WandaVision.
I can definitely imagine that the early days of the creative process have to be extremely rewarding for Kevin Feige and the roving band of Marvel creators.
At least, returning to play the Quicksilver-ish role that Evan Peters took on.