Right. For example, I like that Larian has height bonus. It just shouldn't be so OP. I don't mind backstab giving advantage, but then you need to add another rule that says you can't move around behind an enemy in a melee without provoking attack of opportunity. That's where the problem comes in. It's too easy to get backstab because every round you can maneuver behind them ESPECIALLY with Disengage as a Bonus action.
I mean, I actually think backstab makes sense as an advantage. It should just be WAY harder to achieve. I mean, any homebrew that offers advantage to a roll should be hard to achieve.
