When you create a new organizational relationship for an individual (i.e. new primary business), if you check the "Primary" ox for the address, it does NOT make the address primary.
If this is their preferred address, you have to:
It creates additional and unnecessary steps in NXT AND in Database.
I think it should be a checkbox to "make address primary?" - a primary business relationship just means it's the first preference, but that's not always the primary address, too. In fact, having the business and personal addresses mingled in the database has caused some real unfortunate tangles as folks copy an address out of primary to change it instead of switching the primary checkboxes. (orgs got residental addresses as their preferred, which spread to other individual constituents.)