There's no such thing as a small software team anymore

Uber (in)famously runs thousands of microservices. They ended up there because hundreds of engineers wanted to deploy on their own schedule, with clear ownership over their own code, instead of waiting in one giant merge queue.

For decades a small team had 5 or 10 people writing code at the same time and needed none of that. On a busy day that’s maybe 50 commits/20 pushes/10 PRs. The same team can now run 20 to 100+ agents in parallel, and that day looks more like 500 commits/200 pushes/100 PRs.