I wouldn't say that the comic book style is outdated, yes it sticks out and may be less impressive right now to the common public. It is based on the comic books which are still in print(ish), and as such have a much longer longevity than the movies will. Just look at Spiderman, Hulk, Daredevil, Quick Silver, or Doom. We have seen multiple variations of these in the movie world (yes I know not all are MCU) in a far smaller window, but there is far more confusion as to who is who in the movies than the comics.