You can also mix'n'match. Have a monolithic entity that does most of the work, and split out the heavy stuff into it's own microservice which can be independent

You can also mix'n'match. Have a monolithic entity that does most of the work, and split out the heavy stuff into it's own microservice which can be independently scaled. (Sub in any other reason to separate a service for 'heavy stuff' - written in a more appropriate language for the function, etc)