I’m sorry but that’s not true.
Superheroes are 100% a genre unto themselves as I explained above. They can incorporate SUB-genres and there can be different types of superhero stories but are they a genre unto themselves with their own tropes and what not?
Yeah absolutely.
Thus saying they aren’t a genre is untrue.
You bring up Jessica Jones as an example of the superhero genre except...she isn’t.
She was never a superhero story ever and that was part and parcel of how Jemas talked about her when she was an upcoming character. She was a private eye story, who happened to have super powers, not a superhero. A story about someone with super powers is not innately a super hero story. Spock from Star Trek for example is not a superhero. That’s why the genre is called the superhero genre and not the super power genre.
James Bond hasn’t had a rogue’s gallery since only 2 of his opponents are recurring characters. Bond is a spy and an example of that genre. Superheroes also predate him so its not a good example.
Even if one was to say a rogue’s gallery is superhero trope thing, my description specified that superheroes can have elements from other genres. Moroever its the combination of those and other elements that render them a genre not the fact that other types of stories can have them too.
So...yeah, the costumes, the rogue’s gallery etc, those are absolutely necessary to the super hero genre but the fact that aren’t unique to them is irrelevant. Many genres are distinct from one another but have elements in common with other ones. Its more the fact that these certain elements all co-exist together and are baked into superhero genre stories.