Variations

The technical micro architecture decisions can be made differently for each microservice. But there is a connection with the macro architecture.

The uniformity of the operational aspects can be enforced by the macro architecture.

If you want to implement a microservice with other technologies in a Spring Boot microservices architecture, this can lead to a lot of effort.

A macro architecture decision could be to read out configurations from an application.properties file.

This decision does not restrict the choice of implementation technologies. But for a Spring Boot application, ...