Also ... it seems to me that it works better for replayability if you can simply pick your party and play ... instead of switching back and forth for every conversation your companion have to present on ... :-/
The point is you aren't supposed to switch back and fourth constantly to get ALL the proper interactions, you are kind of meant to decide on a party makeup see the story through based on your choices. The thing is you want to be able to see all 5 companions stories in full in one play through, but unless you KNOW every spot there is a cut scene relevant to their story and every item that may be or interest to them it won't work BECUASE some of the cutscenes are going to be environment interactions.