I watched the launches of SpaceX Crew Demo 2 and Crew 1. I observed that there were no planned holds during the last hour of the countdown.
The Space Shuttle had planned holds at T-20 minutes and T-9 minutes. cite: NASA Countdown 101
Just as the title says, why does SpaceX NOT have these planned holds?
Note for confused commenters and answerers: A planned hold does not affect the launch time. It is already planned into the countdown!