Yeah, I know there are comics fans who like Roy Harper. I don't particularly care either way about him, but here's the big thing: Nothing is more infuriating about Young Justice to me than using Roy. It's not because I absolutely hate Roy, or because I'm a fan of Mia (I really don't like Mia at all). It's because all the promos and the plot hints point to the idea that Roy Harper will leave the team and be replaced by a girl.
Roy Harper is the sidekick character who is the most easily replaced by a female character from the outset. There have been two Arrowettes and there is CURRENTLY one female Speedy.
Speedy is not an iconic character. Roy Harper fans are already knee-deep in comics culture. He's no more notable than Aqualad, who was judged unknown enough that they could swap him out for diversity. I actually think it was a good idea to swap out Aqualad, and would have been a better idea to swap out both Speedy and Aqualad.
Instead, because a conscious choice was made to start this cartoon series as a boy's club, we have Roy from the outset. And he is a jerk. And he is going to be replaced down the line, but because of Tradition we need to start out with a boy's club and women are not important enough to bring in at the start.
You know how the Tradition of starting with none or just one female character on teambooks started? Because they didn't think it was important to have women on the team at first. So in the Golden Age it took them 5 issues from the formation of the Justice Society to even have a backup of Wonder Woman. (Red Tornado was in the first issue, but she was laughed at by the boys and didn't formally join.) In the Silver Age, every team started with one girl (Wonder Woman in Justice League, Jean in X-men, Sue in Fantastic 4, Jan in Avengers) and it often took several issues to give her a good part (Okay, Jan was pretty cool from the outset but Wanda took the prize when she came in; poor Sue took forever to get some real cool moments) and years to add a second girl (Polaris was introduced in issue 50, I think, of Uncanny). Young Justice itself, as late as the 90s, took 4 issues to add girls even though it was launched as part of the Grrlfrenzy event.
This is not because it is good, or right, or "organic" for things to start out all-men and then add girls later. This is because the creators made a mistake early on, and acted to correct it later. The Boy's Club was a BAD thing, and they were trying to undo it. NOW we know better. We can start things on the right path. Continuing this silliness and calling it "Tradition" is wrong-headed and totally misses the point of expanding female roles as time went on.
And saying you're trying to lure boys in and "reeducate them" "organically" is bullshit.