One way to put it is in that single developer code will have more variance, when compared to code developed by a group. This variance has a range of effects, an

One way to put it is in that single developer code will have more variance, when compared to code developed by a group. This variance has a range of effects, and will sometimes be positive, sometimes negative. Certain idiosyncracies are unlikely to survive work in a group, which can be good for the group. But in the case of a single talented unicorn who is inclined to write well-architected code, a group will inhibit that, as each individual pulls in different directions.