I think this is either unnecessary, or a straight up mistake. Wouldn't the tuck under your shingles be an invitation for water to run back onto the roofdeck/fascia? I'd never divert water TOWARD the house if I could help it, yaknow?
Absolutely unnecessary, it actually probably creates more of a chance for it to be caught by the wind and blown off. If you want to do something extra with your first hip for good security, add a few dabs of roof cement to your first hip
))) more hassle then benefit In most cases this area hidden by gutters so nobody will see it If you will nail it right with 4 nails it’s will never be ripped by wind