I think the beauty for me and a New Game+ (such as Witcher III for example) is that you already have all your stuff including for BG3 in particular, the dreaded camp supplies. This game, however awesome it is, has waaaaaaayyyy too many empty or useless containers that just take up so much game time to sift through. Even though I'm on my 2nd play-through atm on tactician, and have over 1,000 camp supplies, I still can't help myself to look in containers (just in case). A New Game+ would allow players to focus on the story and combat with alternate endings without having to go through all the farming which was (kinda) fine on the first play-through.
