I largely agree with the previous poster. If a single brief yaml file is too complicated, you're asking for too much from your tooling. I've seen hideous configuration management systems that did 1/100th of what kubernetes can do. There is some additional complexity around containers which is not a k8s complexity issue, and there are advanced features that most devs will never need to touch. Regardless, I'll take the complexity saved by k8s over custom built tooling or oversimplified PaaS any day.