This is literally in the first chapter of Mythical Man-Month:

> One occasionally reads newspaper accounts of how two programmers in a remodeled garage have built an important program that surpasses the best efforts of large teams. And every programmer is prepared to believe such tales, for he knows that he could build any program much faster than the 1000 statements/year reported for industrial teams.

> Why then have not all industrial programming teams been replaced by dedicated garage duos? One must look at what is being produced.

One reason might be that personal data going into a database handled by a highly experimental software might be a non-issue for this dev, but it is a serious risk for Google, Apple, etc.