I question it on PHRF boats because once one guy has it everybody thinks they need it
Are fall series was on Sat and we had 3 races with say 30 tacks and jibes each so that was 90 times the main had to be pushed
I have seen two things happen
1. A crew member thinks the main is sheeted in but it is hung on backstay as carefull as they should be about keeping there head clear of the boom

they were not and when another crew poped it through without warning
This resulted in a trip to the ER with a fairly serious head injury
2. The crew trying to force it through during a tack or
jib loses there footing when it clears and they have nothing left to balance on
While nobody got hurt doing this i have seen many stumble and hit the deck