Maybe it's time for a 6th edition then. This post isn't about DnD edition rules, but what makes a great game. There's a reason Baldur's Gate continues to be one of the all-time great games, and if that reason is that the 2nd and 3rd edition rules lent itself to a better pc game, we shouldn't be dismissing it simply because it's 22 years old.
It really is though. You don't like very core things to 5E. On that though, BG3 does not so a faithful implementation of the whole system. Even so, like with proficiency, that won't change. They're determined by both class and background. You want it to be by class only.
