Except that every tool that uses YAML config files has its own unique language for embedding conditional logic, with enough similarities to be familiar, but enough differences and idiosyncrasies to be frustrating, requiring you to re-read the documentation every time you need to write anything as it's impossible to remember the half-dozen different dialects of "YAML logic". I also encounter this every time I need to write a non-trivial regular expression, I can never remember the differences in regex syntax for sed, ruby, JS, etc. etc.