As a Sadira main, I can tell you that air breakers are necessary. I mean, her combo trait smacks you up in to the air. Same goes for her throw, two of her enders, her target combo, etc etc. Her main mission is to get you airborne so she can use salticidae, widows drop, widows bite combo hijinks and heavy widows bite.
So if you want to get rid of air breakers without horribly throwing the game out of balance, and I can’t speak to Cinder or other air heavy characters, but for Sadira, you can either take all that air stuff away from her and essentially destroy her, requiring a complete rebuild from scratch, or you leave her as is and make her super S tier.
You might say “take this or that away from her” but as long as she’s an air superiority character, her move set will center around getting the opponent in to the air for what you’d want to be 100% free damage. You take something away, what do you add elsewhere so she’s still a fun, unique character to use that’s focused on getting you up in the air?
I can respect the fact that you have an opinion, but what are your practical solutions to solving the problems a breakerless air space would now create? FWIW Sadira, in my opinion, is a thousand times more fun to use in season 3 then she was in season 1, so simply taking fun toys away, again, doesn’t seem like a solution to me.
As for flipouts, what bothers you about them? I think they’re a fun way to surprise an opponent and keep the pressure on. I mean sure, it’s not fun to get hit by one and you’re just sitting there, suddenly thrust in to making a choice you weren’t expecting to make, but it’s not like you’re utterly defenseless.