Microservices. Not really programming, as this is more on the architectural level. Microservices is a valid approach when you need to address massive scale. The thing is, I have seen it applied to things that could realistically serve its audience in a handful of modest servers with a less fashionable approach. It was done under the guise of simplification; each individual microservice was in fact very small. But this at the cost of absolute spaghetti architecture.