Managing structures in programming language is easier than dealing with finicky optional serialization format. I have drastically reduced the amount of errors,

Managing structures in programming language is easier than dealing with finicky optional serialization format. I have drastically reduced the amount of errors, mistakes, bugs, plain old wtf-induced hair pulling, by just mandating avoidance of YAML (and Helm) and using Jsonnet. Sure, there was some up-front work to write library code, but afterwards? I had people introduced to JSonnet with example deployment on one day, and shipping production-ready deployment for another app the next day. Something we couldn't get with yaml.