Dan G wrote:

There is no way any launch could be violent enough that you'd
pull the release accidently.

You've obviously never been winch launched in a Junior. Forget to really
(I mean, *really*) thighten the harness, and you will slide back and
barely be able to push the stick forward. Ok, pilot's mistake, but I
would hate to inadvertently push the release at this point, which would
inevitably happen if I had grapped it.