I honestly don't get the complaints about combat being house rules. I didn't play lots of PNP rpgs, but from what I've played (plus watching lots of sessions on YouTube) combat is really small part of the experience, and even if you follow the rules like a zealot, your players still have so much freedom that the rules don't really matter. Example: in some dnd session I saw in YouTube, there was a party fighting a giant mechanical beetle, and one party member decided to take his rope and do "empire strikes back" to it. A game could never account for those kind of decisions, so Larian's strategy is to find alternative ways to give players freedom. Specifically, with making the environment super interactive.

Larian's Biggest Oversight, what to do about it, and My personal review of BG3 EA
"74.85% of you stood with the Tieflings, and 25.15% of you sided with Minthara. Good outweighs evil, it seems."