It's interesting, because old comic books have this as well. For decades (I'm not sure if they still do it) every issue of Wolverine would have some silly bit where Wolverine is talking to himself to remind the reader that the has an adamantium skeleton, razor-sharp claws, enhanced animal senses and an advanced healing factor which can heal from almost any wound. Every single issue, nearly without fail.

It's silly to the reader (and especially to an adult reader) but it's also obvious why this was present: the comic was meant for kids, and also Marvel never know when they might be getting a brand new reader who is totally unfamiliar with the character.