Bizarre statement. I hate DOS2 and I really like this game, but the exploration and fundamental structural design is 1:1 DOS. It has copied so many mechanics directly
Pretty much the same.
I believe the change in tone and setting simply makes much more than we realise.
If anything, the transition from DOS to BGIII should be studied as a brilliant case of how much style can matter.
I still can't really put my finger on what exactly makes me interested in most npcs interactions in BGIII when it was the total opposite in DOSII, where I couldn't help skipping most of the cutscenes.
I already felt the same with POE>POE2, where the latter, despite an objectively worst narrative state overall, just felt more immersive thanks to (imo) the artstyle, tone and universal voice acting.