I get really curious about seeing how those that say it's too hard play. Like, do they not use spells, or not look at hit chances, or... what? There's not that many options. Do they just walk straight into every single ambush and never buy gear? Not to sound elitist, I'd just really like to see some bad play because I'm genuinely wondering how this game is hard on balanced. What are they doing? Forget that Stealth and bows exist? Stands in fire? It's... it's very few mechanics!
While I haven't had any problems myself so far, I do think some fights are overtuned.
Especially for players like myself who won't min/max and refuse to play with Larian's cheesy homebrew (Haste, overpowered items, everyone can use scrolls, shove spam, etc) and prefer style over substance the game is certainly not super easy on balanced (and Explorer is not an option for me due to some of the modifiers that are applied). I usually get around the issue by having mods to increase party size and to remove many of the Larianisms and make the game more like 5e.
I'm not complaining though, I knew what was I getting into.
Giving us more granular difficulty options would have been the best approach, but Larian has unfortunately not done this.