It always seemed really strange to me that the largest update of the year, with the highest risk of regressions, would be scheduled to reach the entire fleet on a single day. Like just go from 0 straight to 100, when normally updates roll out over weeks it seems. The only time I remember that happening was with that "Consumer Reports" update for the braking distance, that went straight to 100% on one Friday. So the exception is made for safety critical updates like that.