Earlier quoted context omitted.
You would be _amazed_ how many issues you can get with so-called synchronized time. Ship on-board NTP servers are currently a thing of my team's nightmares.
Well, don’t leave us hanging
Can't go into specifics due to privacy issues, desyncs being common is well-known enough though. It's just unreasonably hard to build a service that's resilient, that doesn't require manual intervention or maintenance.