A while back I was tracking a BOS-PHX A320 route that I had coming up and I would say that 30-40% of the flights made a fuel stop in MCI. So I wouldn't worry about that. You should see all the 747's that stop in ANC on their way across the Pacific, spend 20 min on the ground to refuel, then off again.
Now if you feel that the pilot getting off caused a significant delay above and beyond the time to refuel, I would let the airline know about that.