I think of it as a "where do you want complexity?" tradeoff in this whole debate. Monolithic codebases have complex code but easy deployment and monitoring and coordination (in the sense you deploy and manage one big thing). Microservices have simple code individually but have complex deployment, monitoring and interface coordination. As my team (40 people) moved toward microservices, we spend extra effort ensuring passive changes. Then we have to update and release the multiple services that need updates to gain some new feature. In the past, what was some complex code updates is now complex packaging and intricate versioning. Less code changing...but in more places.

For several reasons, I think our move toward microservices is a good one. But in our case I have seen complexity move from code to coordination.