[zefei]

I really hate people advocating micro services/libraries because they just migrated and "everything got much better". No, everything got much better because the known/actual problem domain changed and system is re-adjusted accordingly. When you start with very little knowledge of the problem domain, any fine-grained architecture is premature optimization, and what you really want is to rapidly expand your understanding of the problem.

Projects can fail in many ways, not trying to understand the problem better and not trying to re-adjust after are typical pitfalls. Migrating from monolith to micros is just a natural transition between SOME stages, and it shouldn't happen until you hit those stages. You may hit those stages very early, or sometimes never.