I've got your back
A point Fox made, you can only get two people in the back of a coupe E9x (not even sure there is a 5th seatbelt).
This happens a lot on new cars now due to some EU regulations about having to get 5 people out of a 2 door, 3 door car in the event of an accident (roll over, head-on, etc).
If you need to ever carry 3 people in the back, you'll need a saloon.
A4 cab as an "almost ran" alternative?