I agree, but in my own experience at a dozen different shops, insufficient abstraction is a mistake that a first-year developer makes, and excessive abstraction

I agree, but in my own experience at a dozen different shops, insufficient abstraction is a mistake that a first-year developer makes, and excessive abstraction is a mistake made by nearly every developer with more than a year of experience. Thus, the team leaders and senior developers can find and catch many of the errors due to insufficient abstraction, but the errors of excessive abstraction tend to accumulate.