Hmm, imo once players get the grasp that you simply have to wait for her to come down that you can then hit her, this will change, at least for Grundy, NW, and KF.(I don't have an input for Aquaman, Joker or Lobo). NW, just like Harley, can IA their projectiles at the same rate you chuck your maces to evade them, while also gaining as much meter. If you want to get work done, you now have to waste meter to add in that extra hit but this also means you have to be in near enough which is right where they want you to be. These three as well have tracking specials that hit grounded opponents, mainly it hits at your location whether you are on the ground or not. If a Grundy player sees your flight mode run out and you start dropping, if he has the meter, he can catch you with EX swamp hands to then combo you for who knows how much. Same with KF and NW. KF has her MB icebergs which she can dash in and slide to connect depending on the distance(I think it will connect at like 7/8 of the screen, maybe even full screen), and NW while in escrima stance for the IA projectiles, can instantly go into his staff slam which he can MB and then follow up with another, or if he's close enough, he can connect a Flying Grayson. These characters as well, mainly NW, I know you don't want to be close to anyways. Just my speculation on it
i would like to think smart hawkgirl players wouldnt just let the flight run out. you can bring her down, bait out the projectile and then land afterwards, or divekick down and block their far too late attempt to hit you. if you're flying close enough to get hit by wing dings, well you are doing something wrong. killer frost and grundy hate her flying because they have no projectile that can bring her down and their air attacks are ass. she can just sit there and just mace charge your approach if she wants. NW does have flying grayson, but that means he has to be in staff stance which has probably the worst jumping ability in the game. so basically you can completely focus on flying grayson and no matter how good a move is you dont want to be a one trick pony
of course those 3 characters all just want to land 1 knockdown so they can put you in their brutal bs lol