Many complaints are about the choice of YAML as a config file format. It is being used for nearly everything, and in many cases fine details of its syntax matter, especially around multiline strings and text blocks[0]. In theory, one can always retreat to JSON, but that's barely better.

Then it goes on: you need additional tools like Helm or Kustomize to generate your YAML files. I am not aware whether anybody has ever tried to generate Kubernetes config files from Dhall[1] input files.

[0]: https://yaml.org/spec/1.2.2/#23-scalars

[1]: https://dhall-lang.org/

And coming soon is an implementation of clojure, made to run in yaml (https://yamlscript.org/). Made by the creator of yaml.