My best guess why thers minicamps organized like the big camp but with other grafics is because of those Campevents.
To have maybe enough resources left for code to be propper executed in a relativly clean NON-WHOLE-WORLD / Campaign area.
So performance wise and reducing propabilities of bug or exploits in the normal Campaigning areas.
F.e. you make camp near enemys, what if a cinematic event has to play out in camp and those enemys somehow become aware ofyour camp event and Fotocrash your event.
Hillarious, funny and gamebreaking
So i do understand why the camps are not like in PATHFINDER : Kingmaker, where you just set it up on the Maparea you are currently are.
Different Games need different solutions. Im ok with that.
