My old boss made me crown a door bottom by 1/16 and I finally get why

Back when I was framing in Cleveland, this old guy named Ray would always check our door rough openings before we set the jamb. If the bottom of the opening was out of level, he made us plane the bottom of the door down by 1/16 to 1/8 before we hung it. I thought he was just being picky for two years. Then last Tuesday I hung a door in my own house, skipped that step, and watched the thing rub the threshold on one side for the next four days. The fix took me 20 minutes with a block plane and now I'm a believer. Ray was right because the door swings on the hinge side, so a small dip in the floor gets multiplied way out at the latch. If the bottom gap is uneven by even a quarter inch, people will notice it every single time they walk by. Any of you still cutting doors square to the frame, or do you crown them to match the floor like Ray did?