Yeah, Scarlet Witch should get her own movie. There's so much they could do with her. I know she's getting a TV show, but the TV shows tend to be light on the special effects, so I don't feel it will do her justice.There are 2 differences:
Intent is number one. The intention of the shot showing the guys is that they are heroes first getting ready for an impossible challenge. Them being men is farther than secondary to the scene. Probably the only consideration in who they are is that it's the Avengers trinity, equivalent to Justice League's Superman, Wonder Woman and Batman. They are THE Avengers, for all intents and purposes.
For the woman, the intent is 100% to show that the woman are together, it's a sludge hammer to our heads, not subtle at all, with them being heroes and up against a challenge unfortunately secondary.
Add to that how forced it is that the truly awe-inspiring Captain Marvel doesn’t need their help, let alone powerhouses like or Hulk or Thor really, adds to how forced it is. Only Scarlet Witch is in her league. Something we all know. Not because she's a woman. But because she simply is.
Good analogy with the trinities. I didn't think of that.