I really don't buy this, its mostly a cultural fad. You can design your system as multiple services interacting via a strict API even in a monolith. Failure iso

I really don't buy this, its mostly a cultural fad. You can design your system as multiple services interacting via a strict API even in a monolith. Failure isolation is a pattern of how to handle errors, whether they come across as a 40x HTTP status code, a JSON field called "error" or a method call throwing an exception. And a single system enables you to work with simple method calls calling across services instead of all the complication SOA can bring with signaling errors/serialization over a network layer. Not to mention all the operational overhead that comes with managing more hosts and more services.