The theory is that microservices are supposed to be independent and self-contained, but such a wonderful implementation of DDD is a theoretical fantasy that rarely plays out in practice. It's not just a technical difficulty but an organisational problem where communication between teams also throws a spanner in the works.

If your typical microservice setup is simply distributing your call stack over a network (and oftentimes that's all it is), then you might as well use a language designed to operate in such a manner and reap the benefits of it. That kind of microservice architecture only really exists as a function of the organisation's structure such that teams can work more autonomously.