The problem with backstab is that an ennemy in front of you, engaged with you suddenly "don't see you" as soon as you jump behind him. Just jump as a bonus action at each turn and backstab your ennemies at each turns.
TB doesn't mean inconsistency because everything is frozen. As soon as you're engaged in any combats, you shouldn't be able to backstab anyone except if you succeed to hide (or eventually an ennemy already engaged by another ally)
I agree. And it would be easy to implement because if you jump, you can't hide, unless you are a rogue with thief subclass. Which means you wouldn't be able to go from being in front of an enemy and backstab them in the same turn.