Hi dirkstrider, welcome to PC!
I've never heard of the term "facets", but instead "fragments" which about means the same thing, I guess. Those that can identify with poly-fragmentation (hundreds to thousands of alters) uses them terms. Alter fragments are one dimensional, created to hold a trauma memory, or a bit of emotion. There are also more layers and sub layer, according to others.
Those suffering from RA are most likely to be poly-fragmented, programmed to do things that they don't want to do from birth.
Alters do interact and influence each other. I know when one is trying to make a decision a voice would come out of no where and say "pick the other one!" Or a strong urge would happen. Usually we put it to a group vote.
The complexity of it all is incredible.