Do Less Proficient Coders Avoid Running Unfamiliar Code?

I’ve wondered for a long time why some software engineers increase their skills consistently while others seem to get stuck in skill plateaus.

This blog post goes into detail on the theory that expert coders benefit from the compound effect of a habit of running unfamiliar code in isolation.

Curious to know if others have observed this and agree that ineffective learning strategies are the main culprit holding some coders back from reaching their full potential.