I must admit a certain trepidation anytime I hear the phrase, "and replace it with a constraint solver!" Not that they aren't useful and powerful tools. That's exactly the problem, they're very powerful tools. I'm not entirely convinced that doing website layout should require so much computing power.

Also, ironically, the site looks pretty bad on mobile and the entire left side of the page is chopped off. I don't take any "new ideas in style" page seriously if the mobile (or desktop, or whatever I'm using) experience on that page is bad.