I think the goal is to have a language that feels like it was designed for level 3/4 but allows you to break out to level 5 as an escape hatch. Given how many

I think the goal is to have a language that feels like it was designed for level 3/4 but allows you to break out to level 5 as an escape hatch. Given how many configuration languages eventually end up with a half-assed level 5 (Greenspun comes to mind) it strikes me as, at least, an experiment worth performing.