In general (not just limited to Pkl), I think the advantage is that you get IDE support like autocomplete and compile time checks. Pkl seems to borrow some feat

In general (not just limited to Pkl), I think the advantage is that you get IDE support like autocomplete and compile time checks. Pkl seems to borrow some features from JSONSchema/SHACL for example where one can also add validations like "value must be bigger than 20 and lower than 100" so when you configure a component incorrectly, it can throw a good error message before deployment.