If you have times that are synced to within a few microseconds, then any logs you have will have much less ambiguity to the sequence of events that happened in

If you have times that are synced to within a few microseconds, then any logs you have will have much less ambiguity to the sequence of events that happened in a system that crosses multiple computers. You also get a more unambiguous (but still imperfect) measure of "what event outside the system happened first."