For what it's worth, I totally agree that pausing the world would be the way to go. If my party decides to split up, then that's how it goes. You spend your rounds dashing to the rest if you're close enough, or you take a break and watch the rest of your party battle.

if your party separates in a D&D campaign, one half doesn't get to spend 6 months of time adventuring and exploring while the other half has one 10 minute battle.

The bitching about this game being co-op infuriates me. From what I can find, this is literally the ONLY current turn based fantasy rpg in the world. We've been through DOS and through DOS2 numerous times. Been through BG3 EA even more. Searched and searched for something else and there's nothing. So you want Larian to nix arguably the most clear cut feature of this game that sets it apart from all others. ALL others. ??? Really? Just so your personal gameplay is a bit more fine tuned to your liking? (Tuco, et. al.)