Well, it's been a Marvel thing since the 70s, so I've never had a problem with the similar heroes with similar powers. Because in the end, we just get guys like Wonder Man, Nova and Hercules who have the same generic powers as everyone else anyways, but without any of the thematic and storytelling connections like between Hank Pym and Scott Lang, for instance
But I do agree about supporting the lesser known characters being a major function of teams like the Avengers