That's my feeling too. Tools like this are trying to squeeze into the space between "straightforward configuration easily maintained in static files" and "complicated state management better served by real code in a real programming language". And that's a real hole for some applications, but it's a small hole.

Basically forcing everyone to learn new tooling (Pkl here, but lots of json/yaml middleware nonsense fits the bill too) just to deal with what really isn't that big of a problem seems like a bad trade.