This lack of compatibility was exactly why I was initially unsure if I could enjoy the game. Rangers and Barbarians used to be a special kind of Warrior, so you had the extra strength column that other classes, capped at 18 for humans, didn't get. You can use books from across the TSR editions interchangeably with little or no adaptions, but Wizards changed the game and many narratives in such a way that a lot had to be "re-imagined" in distorted form. Luckily, I didn't play the earlier BG titles (yet?), so I met Jaheira, Minsc and Boo for the first time in BG3.
