Since I've played DoS2 in Tactician Mode, I think nothing could be more difficult than fighting a lvl 15 boss when you are 5 levels under. Man, DoS2 on tactician mode gave me a lot of rage quits and screams and anything in my range I could throw at my TV. Ofc I didn't throw anything at my TV, but God knows the unraveling rage I felt whenever things gone (very) wrong in my gameplay. For me, BG3 is being difficult for most people only because of bad RNG when casting spells: same thing usually happens to me as I don't have luck with RNG most of the time. Honestly, if you think BG3 is hard then you never really played a real difficult game. Besides all the rage I felt playing DoS2 in tactician mode, dude, I absolutely LOVE that game. It is unfair at some moments, but at the same time the feeling you get when you beat some really hard fight is priceless.
Ofc there are some fights in BG3 that you aren't meant to encounter when low level, but this is what makes this game versatile: you can try even if you are underleveled. As I said, it may be unfair, but when you are victorious you don't even think about the unfairness nor the bad dice rolls.
