I am an ardent supporter of the tape retention method for all single use motors. If you loose the motor (and hope it had enough time to pop the chute) on ejection, you loose nothing. However, when I went to 29mm reloads, I did not feel like loosing my casings, even though I agree tape would work fine. ive progressed from cheap washer/threaded inserts to PML retention system all the way to slimline.
The only reason I really don't use tape retention is the fact that when firing, the tape smushed between the motor and motor tube heats up and the sticky part of the tape seeps out, and when the motor cools, its like gluing your motor into your rocket! No sure if this happens on reloads though.
Ever try to get a G37 out of a tight motor tube after firing?