Originally Posted by
Kaitou D. Kid
Yes. It matters because 1) Billy Batson doesn't do much for teen representation (like you said, the reader sees Batman and Bruce Wayne as different ontological entities) while Peter Parker actually did, and 2) Billy Batson doesn't answer the fundamental question of whether a teenage superhero can be independent in the same way as an adult one. Season 1 of Young Justice is the best example of my second point. Captain Marvel is treated as a senior to the entire Young Justice Team and has to supervise and mentor them on several occasions, even after Batman and several other Leaguers find out he is actually a kid. Meanwhile the Team shouldn't even think about joining the League anytime soon, even though they're all older than Billy. It's differences like that that make Billy Batson different from other teen superheroes and especially Spider-Man.