The Importance of Scalability in Microservices

The reason they are independently scalable is because each microservice is running in its own process. So if you start seeing it as a bottleneck, rather than having to rearchitect the whole system to solve that bottleneck, you can just focus on the microservice. One of the sort of the dreams of microservices often is polyglots. But of course, those two aren't the same thing. You can have a very modular application that runs in a single process. And you can have an incredibly coupled spaghetti nightmare that also has interprocess communication to worry about.