This is one of my concerns. While our DnD group is 7, there is a core part, myself and 2 others, who are pretty hardcore. We played the hell out of Div2, and I expect the 3 of us will go nuts on BG3. The rest of the group are a bit more casual, and I can absolutely see someone join us, and then not be able to play as much as the other 3. What do you do in those situations, just lug that character around like unwanted baggage while playing without that person? I really hope we have more flexibility in bringing people in and out!
Yes, just make sure you or one of the Hardcore folks are the ones Hosting. Save files can be copied to another player but it's a process and I have only done it a few times. Would be nice to have a tool to facilitate that.