So the Legend himself, SuperDan has coined many a good phrase but my absolute favorite was when he said, in all seriousness and in a perfectly straight face, that it is unsafe to ride dirt under 35mph. This probably goes with his life long philosophy of "when in doubt, throttle out."
I think about this sometimes when I am riding off road and often notice that as my speed increases, my bike feels more planted, obstacles are no longer noticed as I just float over them :) When I struggle the most is when I am going to slow. That is when I drop the bike. So, I think there is some credence to the SuperDan credo of being unsafe under 35mph.