You have 5th level characters killing a CR 26 Adamantine Golem out of the gate, and while it relies somewhat on a gimmick it also heavily nerfs the capabilities of that creature, like its ability to basically punt you into the Lava or useing it's stomp ability do 4d10 damage to everyone around it. They also nerf it's AC, make it vulnerable to bludgeoning weapons, take away it's immunity to non-adamantine and non magical weapons.
They do the same with Adult Red Dragons - they are CR 17 creatures - they can fly and attack us from the air - not in Bg3. Here they are nerfed to shit.
I would honestly love a proper difficulty setting with core rules and creatures with abilities RAW.
Tell me about it.
On my second try I just twin casted haste on my Monk (no tavern brawler cheese even, straight up dex shadow monk) and Warlock(lol) who had blunt weapons, put up faerie fire on the golem, and proceeded to kill it in 2 rounds right in front of that shaft it crawled out of. Swords bard with defensive flourish and mirror image tanked that 1 hit in between the two rounds. Monk even managed to trip it with reverberation build up. Yeah, my party was lvl 7, but still (tactician, i imagine it's a complete joke on balanced)
Yeah, the enemies are "cool n shit" but make no sense from canon dnd perspective. Act 2 caliber of threats should have been the maximum we are dealing with, and "apostle of myrkul" type of boss should've been the "endgame boss". You're right, if Larian used "raw" rules, we would never finish Act 1 even, the party would've been wrecked, game over.