The reason for "Tony Stank" for me is it's not intrusive on the plot. The film doesn't, like Black Panther and Ant-Man and the Wasp for example, stop in its tracks for a moment to give Stan Lee an otherwise unnecessary moment. It's a natural part of the film at a good moment where you're not breaking tension (unlike X-Men: Apocalypse for example), it utilises him specifically because you would give that role to an older man anyway, it's not over-indulgent, and it's funny - plus it's in the best MCU film, in my opinion.
All in all, my favourite.
