Exactly. One of the ideas with this is that someone with “just” HTML/CSS/JS could make/sell a usable, CMS backed site without having to jump through all the hoo

Exactly. One of the ideas with this is that someone with “just” HTML/CSS/JS could make/sell a usable, CMS backed site without having to jump through all the hoops the modern web demands of them, while at the same time not being limited by the rigidity all the page builders seem to have.