It's not just about code -- microservices can offer a degree of modularity on an infrastructure level. For example, a microservice can own its own database. Be

It's not just about code -- microservices can offer a degree of modularity on an infrastructure level. For example, a microservice can own its own database. Being able to experiment with languages and tools (as you mention) is also a pretty big advantage. HTTP offers a universal communications interface beyond language-level APIs and ABIs. When we think about an entire department with many teams with a diversity of expertise, at least we can guarantee everyone understands HTTP.