> However, because of clock drifts and/or assumptions around network time delays, timestamps from conventional clocks are not always mutually comparable, and therefore events cannot be reliably ordered using timestamps from conventional clocks.

I don't think that this distributed logical clock solution isn't worth working on, but some combination of a low-stratum NTP server combined with PTP is good enough for most people, I would think, but cloud solutions are mixed.

- Azure Time Sync uses PTP - https://learn.microsoft.com/en-us/azure/virtual-machines/lin... - AWS time sync uses NTP - https://aws.amazon.com/about-aws/whats-new/2017/11/introduci... - Google Cloud also uses NTP - https://developers.google.com/time/faq