Agreed that a parachute is of little benefit to the occupants of the average GA touring aircraft. Aerobatic types designed with egress in mind are a different matter. You wouldn't condone keeping the seat pins in place in the JP or Hunter would you?. Still not clear why you would wear a parachute for intentional spinning, but not when an inadvertant spin is likely. Discussion of spin recovery is no substitute for practice - when was the last time you span the Yak inverted? (and as it happens, an associate of mine used to take his Cap 222 down to Boscombe for use by the school, but ceased to do so when it was damaged in the process....but I don't know if the handling pilot subsequently graduated).
