What I always wonder is why you don't see more CAPS systems in aerobatic aircraft.
Some years ago, on behalf of a manufacturer of an aerobatic aircraft I asked the FAA if such a system would negate their requirement for individuals to wear parachutes in ops where they are required by the FAA - answer was "NO". Our response was OK, if individuals are going to be wearing parachutes then little benefit in equipping the airplane with a system with that additional cost and weight.