Well, okay, yeah. Doing things for the sake of doing them is dumb, especially in Rotor's case, because Rotor's been around since SATAM and is well established as a character. Kneecaps though was created by Penders in the first place, so Penders kind of had more of a right to decide what Kneecaps sexuality was/would be in 25TYL, especially since he's only a baby in the present time of the comic so he had zero characterization at that point anyway. However, like I said you're also right about how it would've been problematic then to introduce that into a kid's comic, but only because parents would've complained and there would've been a lot of controversy. They might have a bit more luck nowadays, but even then people probably would still complain, so I doubt they'd ever do it.