Something that can be taken from the airline world is the possibility of a tail strike. Without flaps the nose will be higher to generate the same lift coefficient. Obviously a normal approach in most trainers doesnt create a problem in this regard, but if it's botched it gets interesting. The wind was howling yesterday, and I recommended a no flap landing to my student. Used to teaching landings with a normal flap setting, when my student flared a little high I didn't react because I'd "rode out" arrivals like this one before. The airplane came down hard on the mains and whacked the taliskid hard as well. I didn't make the connection, so we went up and tried it again, with the same loud result. I know, stupid move on my part, but something to consider.