LOL! arguing that a 1 series coupe is as practical as an A3 is going to be a tough sell!
Yes, the A3 a lot like a Golf with less headroom in the back, but have you seen the headroom in the back of a 1 series coupe?? And yes, the 1M has folding seats (and the A3's don't fold completely flat) but still I can assure you that you can put more things (and or larger things) in an A3 than in a 1M.
There are many reasons one may prefer a 1M over an RS3, but 'practicality' is hardly one of them!