If you are concerned about exploits and tactical depth of combat, Larian does not seem to designs around balance, which they equate with min-maxing (see
57:35 to 59:11 in this video). If your concern is the aesthetics, well, I'd have preferred a bit more "realism" but I think that Larian's vision of the Forgotten Realms seemingly won't be the classical medieval-renaissance fantastic style, with warriors in heavy armour and rare sources of gunpowder and hand grenades ...
As for Jump used specifically to obtain a Backstab bonus (as opposed to jumping to Disengage), I'm tempted to be cheeky and say "if you don't like it, don't use it". Just walk around the enemy. It may require a bit of practice, to make sure you don't trigger an Opportunity Attack (break out the move in several smaller moves). It also saves you a Bonus Action, which can be pretty useful if you're dual-wielding.
