No, backstab to have advantage is not a thing in DnD... Neither is highround to have an advantage and give disadvantage. Those two mechanics makes you become gods without any consequences.
Shoving is not something you're trying at every turn in DnD... like anything else : it's a tactical choice.
In BG3 there's close to 0 tactical choices. Just use those cheeses to win easily even in a solo playthrough.
