Having air attacks with over 5 active frames normals is ridiculous, NRS doesn't change this because they don't want to, as long as Jump kicks still have over 5 active frames they will always be broken, it's a scrub assist mechanic which allows anyone in the game jump as much as possible and put a kick that jab has 5% chance of beating it while looking for everything else.
I can jump to beat anti-airs and if they respect i'm plus enough to back dash and bait anything, which i think it's just ridiculous, on top of this, there are characters who can jump and fire projectiles in the air at will mixing up their way in and you can't do anything about it.
The easiest way to balance jumps in this game without adding anything to any character is to make any jump kick active frames down to 5 frames instead of 8, this will make anyone use their jump attack more sparingly, will force players to decide either they go for a deep jump kick to get their plus frame, or for a shallow jump kick to beat anti-airs, either way, they won't have both ways, and this alone will make any anti-air normal in this game a lot better.
The thruth is, ppl who design this game with this mentality don't help either, from the get go, i think the devs and QA are the biggest scrubs to allow jump kicks with this mentality, how else will tyler and derek be able to have a decent match? I bet in the NRS studios, the first approach they think about when designing characters its either jumping in or using a normal that reaches halfscreen away and design the game from there, maybe adding very strong projectiles with massive hitboxes that no one can jump on reaction, and if that is still not working, just give them a teleport.
