I use fairly precise time but that's because I control high speed machinery remotely. The synchronization is the important part (the actual time doesn't matter)

I use fairly precise time but that's because I control high speed machinery remotely. The synchronization is the important part (the actual time doesn't matter). At 1200 inches per minute, being a millisecond off will put a noticeable notch in a piece. Ptp and careful hardware configuration keeps things synced to within nanoseconds