I think the big problem with the microservice movement is that it is easy to understand but difficult to implement. It reminds me of when OO was new on the block and people designed these really elaborate OO hierarchies only to have them break down over time. Then came "OO SUCKS" because there was a level of experience required to understand what level to take your modeling to.

The same thing is happening with microservices. Engineers are microservcing ALL THE THINGS at such a fine grained level that it becomes a nightmare to maintain, orchestrate and manage. Therefor "microservices suck!".

Most of the time, you can model your domain into a few key areas, say 'customers/security', 'interface' and 'processing'. That's a good 3 service start. You may never need to go beyond that. However, as your needs grow or change, you can start to refine your model based on changing business needs or scale/performance/infrastructure issues.

In my experience it's a completely logical way to design a system and is really no different than making 'libraries' of code all housed under a single master application. The only real difference is the underlying communication infrastructure.