If you’ve ever wasted half a day laying out shoulder cuts in deck posts by measuring, marking, squaring, rolling, measuring, marking, squaring, rolling … this will make you happy.
My personal hack is to cut a block from one post, then use it to mark all the others. If I built decks all the time, I’d just keep one in the truck all the time.
This deck builder definitely puts some speed on the track with his system.