I really value your contribution, thanks for sharing. I give the proponents/consultants credit for proposing a practical and incremental solution to these peop

I really value your contribution, thanks for sharing. I give the proponents/consultants credit for proposing a practical and incremental solution to these people instead of just insulting them or saying "you're doing it wrong". That being said, the issue I have with microservices is the fact that the below is repeatedly used as a core technical argument : > They had built the whose system using the classic, box-box-cylinder architecture. There were hundreds of little top tier 'services', but in practice, they all shared the same database, had to be deployed pretty much at the same time, and version upgrades had to go in lockstep. Every so often, database changes were necessary, and the world would grind to a halt for months to make the system still work after the migration: It was awful. This is not a feature of "monoliths", this is a feature of shortsighted design (at the beginning) and cowboy design (at the end). Let's be clear : apart for load balancing for performance critical areas (which only exist in 20% of the applications, and only cover 1% of a typical such application - or 60% if you are Google, Facebook, or Amazon or the rest of the top 10), there's nothing that microservices do better than in-memory libraries. Also, centralizing everything as opposed to having processes run on various servers creates the issue of the single point of a failure. Whole new classes of similar issues appear. It basically is buying troubles. Adding microservices will never be a neutral operation, and incurs a real cost. This cost is the cost of distributed objects which has been known for over 20 years and has been well-documented by our fathers. Once the above has been dismantled, it then comes to : "yes but teams can develop in different languages", "yes but dependency management becomes easier". But once again, when it comes these interoperability considerations, a solution also exists and has been created about 15 years ago. This solution is called .NET (30+ languages compiling to a single Intermediate Language, COM components, first-class library support, etc...). Even the "yes but I need to communicate with non .NET in-memory applications" is very maturely addressed by the framework. (it was one of the first-use cases addressed) I also read in this thread : "the ability of teams to control their own destiny and not be blocked by other teams". With libraries teams can choose the version that works best for them, and a well-design in-house library would provide the extension points (Dependency Injection, Dynamic Binding...) that would allow the clients (the other teams) to specialize the behavior. So in a gist, my main reproach for this, is that if people put the same effort they put in learning microservices to learning system and component design, they wouldn't even be a need to talk about the former. My regret is that people will always choose the hype and the new. But hey, that's how the game works.