[Marvel] Why don't more heroes organize/befriend each other via similar powers?

Obviously the Spider-family and the Hulk family exist, but I mean powers that have something in common despite their power source.

Imagine you are Johnny Storm. You think you are the most unique guy ever, a one in a billion accident. Then you find out about a mutant called Sunfire, who can do the exact same thing. Wouldn't you fly over to the X-mansion and have a talk with the young mutant, just to see if the rumors are true? If he is more powerful than you? If you can team up maybe?

If Johnny creates a flame, can Shiro dissipate it?

Wouldn't Storm and Thor, two formerly worshipped elemental gods, want to get to know each other more? Find out who really controls the weather? If Thor creates thunder, could Storm make it disappear?

Why isn't there a club of telepaths? A club of aliens?

Why aren’t the various super soldiers more connected by their shared experiences and similar abilities? John Walker and Cap should, despite the former's ultra-patriotic zeal, treat each other like brothers, right? (Same army, same powers, war veterans, patriots)