I think that works for Batman, who already lives in a fictional city. But not for the Marvel characters, who are at their best when they are rooted in the real world in which we all live. The thing is, the sliding timescale isn’t a problem except to the relatively small number of fans who like to think this deeply about this stuff–and even for them, it’s not an issue most of the time. So there isn’t any need to change the way we operate. Whereas putting the Avengers into a fictional city would be a huge foundational change to the kinds of stories that we tell.
carlosjdrew liked this