I've naively used millisecond precision things for a long time - not in anything critical I don't think - but I've only recently come to more of an awareness that a millisecond is a pretty long time. Recent example is that I used a timestamp to version a record in a database, but it's feasible that in a Go application, a record could feasilby be mutated multiple times a millisecond by different users / processes / requests.

Unfortunately, millisecond-precise timestamps proved to be a bit tricky in combination with sqlite.