This makes sense for timestamps in traditional logs. You don't have to second guess the order of things, especially across multiple systems or services.
I meant unix and NTP times, which are supposedly just monotonic numbers marching forward (except for leap seconds), not the UTC representation over abstract time.
I know we just get a 60th second in a minute. What unix and NTP timestamps do (or originally did) was repeating a second. Then we got other hacks to keep monotonicity, like smearing. Not without tradeoffs.
This makes sense for timestamps in traditional logs. You don't have to second guess the order of things, especially across multiple systems or services.