Need from/thruDate on SegmentGroupRole?

[Al Byers]

As I understand it, SegmentGroup is there to handle sales territories. 
If so, wouldn't it be desirable to attach sales reps to a region by the 
SegmentGroupRole, and if so, since that would be a high turnover 
position, wouldn't it be good to have it time constrained by the 
from/thruDate?

I see where PartyRelationship is tied to the SegmentGroupRole via the 
SegmentGroupViewRelatedParties view, but I don't see how that would 
apply in this case.

Was the intent just to replace or delete sales reps as they became 
active and inactive?

-Al