Guys, I'm sorry you feel that way and I used to as well, but after spending a lot of time playing the game and also reading a lot in r/dndnext over the last couple of years I've realised that D&D has a lot of imperfections. There's no point slavishly recreating it RAW. Even the developers have regrets and are doing surveys to see what people would like changed in 5.5E – which at this rate will come out just after BG3. So even if BG3 was a perfect adaptation, it would only be rules-accurate for a year at most. WotC is even deprecating short rests, based on the most recent books where all the racial short rest recharge features have been changed or removed.
Yeah...no. This "defense" is the weakest of weaksauce; there were plenty of good to great D&D games from the early 90s up until the mid 2000s. If the task of adapting the latest iteration of D&D (not to mention the Forgotten frickin' Realms!) was too challenging or annoying for Larian, they shouldn't have stepped up to the plate.