I do not know who do you refer with "most people" (¿?) but you have the possibility to customize the difficulty options. You cannot hit anything or enemies just save everything, lower the stat growth option, if you feel there are too many enemies, lower the difficulty option, if you feel the progression is too low... well. you know.
I mean I don't play on Core, which is why again I cannot give a fair assessment of the higher tiers of difficulty, but I do know that most people discussing the higher difficulties without any alterations say that the base options are a bit off. Like my tabletop DM that is giving WotR a whirl says that the Core settings right now are basically a DM constantly trying to one-up their players, and thought it was far better balanced once he went into the settings and lowered the number of enemies to normal.
I know it's great that we have a lot of options to tweak the difficulty and that we should really take advantage of it, but that doesn't mean it should absolve the devs from putting in a little more thought on that front. Especially when it seems there are achievements assuming that you are playing on Core with no changes to the settings at all. Even so, such arguments are only really a stone's throw away from the arguments about how we should just mod things into BG3 to fix perceived design issues there.
At least you have the option to change the things you do not like without resorting to modding the game yourself. I mean there are 7 different modes, and even more difficulty settings. That´s much more than 90% of the games have.
If you want to boast about playing in hard but it´s too hard for you but you do not want to lower the difficulty settings, or you want the achievement for playing in hard mode but you do not want to play the way hard mode is in the game... I do not think the devs are to blame. If they give you the options but you do not want to use them, well... I do not think it's the devs fault. It´s unrealistic to ask them to reach the sweet spot of difficulty for every player. They give you the tools. It´s the player the one that is not using them.
Maybe it would be better if they created yet another difficulty mode, going up to nine or more? =D
Core, hard for posers, really hard, bullshitting hard and unfair.
PD: if your DM, being DM is used to know the statistics and the difficulty of the encounters I bet he is astonished about the enemies´ stats. It happened to me too. In KM and now in WOTR the monster's stats are less than core, the enemies are buffed in comparison. It took some time for me to get used to. PnP is more forgiving with the players. If I give the players a dc 25 diplomacy check at level 1 they`ll poison my pizza for sure XD That said, in tabletop you cannot reload =P