To clarify, if I was introducing someone to the Diablo series for the first time and told them they’d have to start on the first one. I wouldn’t want them playing the bare vanilla version. There is a Bezelbub mod out there that gives the game lots of QoL improvements, you’d be thinking you’re playing a build of Diablo 2 before its final version.
So, if I had to tell anyone what the best way to play that game would be, it is the Bezelbub mod. That was how I’ve beaten the first game anyways.
Of course, if you don’t look up any builds a first playthrough of BG3 will be indistinguishable from one with a loot randomizer.
Obligatory, if you do want a roguelike BG3 you can get that with the Trials of Tav mod.