During an experiment, I installed my driver shaft (Ping G400 SFT) onto my 3 wood (Ping G400 SFT) and noticed more efficiency. I gained 15 to 20 yards off the tee and my fairway shots required less effort.
As a result, I currently have my 3 wood at +1.125” longer than stock given me a even gap in shaft on my driver to 3 wood to 5 wood.
You're quite right. Rule 10.2b applies in both match play and stroke play and affects caddies and partners.
Wasn't there a rule change this year about standing behind a player during their setup or while making a stroke?
Only in Four Ball?
This often occurs during a putt, and sometimes a partner assists a partners alignment.
Driver/long game is king.
But 'worst' short/putting, like worse than my 13 year old who putts off the green from 10 feet most times? Yeah no. 'Worst in the world' of anything would have me looking for a different sport.