I think it mainly comes down to the length per encounter, on top of the turn based system and mechanics I'm very unfamiliar with. I have pretty severe ADHD too, so it's kinda a perfect storm of combat mechanics I've never been a fan of. I prefer real time, "learn the patterns" style combat ala Dark Souls or Sekiro. If I was younger and had more time to play, I'd likely have pushed through and learned the way BG3 plays on a fundamental level, but the reality is, I have 3-5 hours to play once or twice a week, and I just don't want to sacrifice time in a combat system I don't find enjoyable when I could be out adventuring and meeting new characters.

I'm a different commentor but wanted to reply with my biggest complaint about the combat is that I can't skip the enemy turns and fast forward through them. It gets real tedious when you get into the encounters with like 20+ enemies. Otherwise I enjoy the combat. Do wish opportunity strikes against me would trigger a warning and ability to cancel my movement though since I often miss the red arrow or I misclick 1mm too far.