In my view anyone who flies a difficult plane because it is, is insane. Why fly a plane you have no affinity for? I fly the mossie not because it's anymore difficult, but because i love it, i have lots of fun flying it. I die enough times, but it is damn fun.

Doesn't stop me from hopping in a spit though.
What makes a plane difficult? It's not easy to quantify using a single performance characteristic. Does lesser turning ability make it more difficult? That only poses a problem if you have not acquired enough experience to overcome it. The majority of moves in one plane can be transfered to another.