We had a large, complex, spaghetti-driven monolith before the microservices. Aside from a few microservices which support our infrastructure, a microservice usually serves a single subproduct; several subproducts are united under one UI, they only share the user model and communicate via events. I didn't mean our microservice architecture is minimalist (although when viewed alone, a microservice itself is pretty simple), I was giving an example as to why copying code has disadvantages, too, such as once you decide to copy the code instead of using a dependency you are completely on your own, you will miss any new security, performance updates and bugfixes; even supposedly trivial code can be ridden with subtle bugs.