[barrkel]

Custom grammars are a cool idea. They are terrible in practice and one of the biggest reasons why Lisp failed to take off, why it's almost noone's first choice of language for building something big.

The reason is that new grammar creates a new language, and the divergence of the new language from the base language creates a cultural barrier that inhibits communication. It's harder for new engineers to be productive, and it's harder to collaborate.

Customizing your grammar works best if you're a lone wolf, a one man band. You can lever up your productivity by custom-designing something perfectly suited to both you and your preferred problem domain. But nobody else will understand it.