I mean, I get why comics writers want to stick to a world that's mostly like ours. Like you said it avoids making it practically impossible for a newcomer to pick up if they weren't around from the beginning, and allows the writers to focus on plots other than logical extrapolation of largely alien worlds. Especially when many of the stories they want to tell hinge on real world political/cultural elements.

The thought was more born out of realizing that if people were going to fridge logic one or two stray elements as being "unrealistic", wondering how many settings wouldn't unravel completely if you really tried to fridge logic the heck out of them.