I've wondered this myself. My airline specifically prohibits flaps 2, with many a bulletin to reinforce it.
We also use flaps 1 for takeoff when needed in both the 800 and 900. Honestly, the tail clearance isn't as big an issue as the v1 and vR speeds. Rejecting a takeoff at speeds close to flaps 1 v1 would be an interesting exercise in braking.
