Yeah, it's quite weird to see such an obscure feature being proposed as a CSS standard. The demos just aren't convincing? Sure, I get the Pinterest application,

Yeah, it's quite weird to see such an obscure feature being proposed as a CSS standard. The demos just aren't convincing? Sure, I get the Pinterest application, but the other ones seem like a solution in search of a problem. In the megamenu demo the multicolumn layout is pretty much indistinguishable from masonry. The only thing wrong with it is that it allows column breaks in the middle of content. That doesn't need masonry to fix it. In the newspaper demo the multicolumn layout is actually better, because that's how newspapers work. The masonry demo becomes an unreadable mess. The museum demo almost feels intentionally mis-designed. The CSS Grid 1 layout obviously has issues, but it could've easily been solved by pulling the nav bar out of the gallery, and using a multicolumn layout for the gallery instead. So that leaves the Pinterest-style photo gallery. Sure, it's objectively better if you want to achieve this kind of style, but it's an outdated design with horrible UX. Why is it special enough that we need explicit support for it in the standard?