Comment by troupo

Because it's a mish-mash of different ad-hoc DSLs.

You have a DSL based on data-* attributes

But then some attributes get this weird syntax-ish extension

Then some of those attributes accept a Datastar expressions DSL: https://data-star.dev/guide/datastar_expressions

So you can have

   data-on-click__debounce.200ms="$landingGearRetracted && @post('/launch')"

Which is just bad design