But well-defined interfaces are not specific to microservices (ms). Low coupling, high cohesion, separation of concerns and well defined interfaces are simply s

But well-defined interfaces are not specific to microservices (ms). Low coupling, high cohesion, separation of concerns and well defined interfaces are simply system architecture. Which is easier to work with without the infrastructure overhead of loads of semi-independent ms. Ms is a net loss here because your complexity budget is consumed by the infrastructure instead of the system architecture. Fault tolerance again is largely orthagonal to ms. It's a matter or system architecture, see the point above. e.g. A common situation where service one depends on availability from service two, having them as seperate ms doesn't help, what helps is architectural design to keep service two useful somehow regardless, and this is orthagonal to if the services are in process or done as ms. Scaling is a whole other discussion, and microservices can have good impact here, but so can other techniques.