It sounds like creating this type of environment requires several components to achieve the goals.
Jeremy A. Cunningham

You’re making a very interesting point about critical size. We felt this in out team as well.

As soon as we reached the magic number of 3 devs, we started to get into the habit of peer reviewing ALL our code (to catch bugs, and also learn from each others).

This was virtually impossible to sustain with 2 people only. Sometimes I wanted to merge some code asap but my colleague was busy, so I had to merge without review. With more people, we usually find a reviewer available anytime.

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