I think Larian Games do very little to explain their rules to the player. I, too, found it incredibly frustrating when I played Divinity: Original Sin and later, DOS 2. So while I didn't carve out time from my day to learn the ins and outs of Baldur's Gate III, I did have experience with the other two games that helped me navigate it.
I adore these games but it took many hours of training for me to understand what it was I was even supposed to be doing.