I disagree with this advise as a general rule. But maybe it makes sense in this context.
If only small section of road is visible then mapping it (maybe with fixme=continue at is endings) is better than not mapping it.
Note, that applies only when something is definitely a road. If it is not fully certain is it road or something else not mapping it is likely better.
I am not sure about sections of dirt tracks - is it likely they dynamically change location? Like logging roads that in area known to me change location? And often are single use and will not be used fire decades until trees at forest plantation grow to be harvested again?