> many websites would do just fine with just those two (as in, they don't need JavaScript at all!), and I'm sure a very large fraction could get by with some sm

> many websites would do just fine with just those two (as in, they don't need JavaScript at all!), and I'm sure a very large fraction could get by with some small amount of hand-written frontend code hooked up to a database. And that's where companies like Squarespace come in for their value prop: we'll handle all of the back-end, asset hosting, etc. for you, give you a set of pre-built templates to choose from and allow you to tweak some of the CSS. Businesses are less interested in pure HTML and CSS skills because they can get "good enough" for a few bucks a month and not hassle with a developer that's charging market rate or get into the weeds themselves.