99% of systems out there are not truly microservices but SOA(fat services). A microservice is something that send emails, transforms images, encodes video and so on. Most real services are 100x bigger than that.

Secondly, if you are not doing event sourcing from the get go, doing distributed system is stupid beyond imagination.

When you do event sourcing, you can do CQRS and therefore have zero need for some humongous database that scales ad infinitum and costs and arm and a leg.