Microservices are not only "function calls over TCP" though. There are other concerns such as database per service vs a single shared database. There are also s

Microservices are not only "function calls over TCP" though. There are other concerns such as database per service vs a single shared database. There are also security implications that you don't have with a monolity. Designing it that way from the beginning could easily be as complicated as making them separate services.