Modern CI is too complex and misdirected
It's weird that people keep building DSLs or YAML based languages for build systems. It's not a new thing, either - I remember using whoops-we-made-it-turing complete ANT XML many years ago.Build systems inevitably evolve into something turing complete. It makes much more sense to implement build functionality as a library or set of libraries and piggyback off a well designed scripting language.