Uber infamously runs thousands of microservices. They ended up with so many services because hundreds of engineers wanted to deploy on their own schedule, with clear ownership of their code, instead of waiting in one giant merge queue. For decades a small team with 5 or 10 people writing code at the same time didn’t even need to consider doing this. On a busy day a small team might generate 50 commits/20 pushes/10 PRs. A small team today, running 20-100 agents in parallel, might generate 500 commits/200 pushes/100 PRs.