But, you can get all of these things from HTML. Especially visual hierarchy and accessibility. The cornerstone of accessibility on the web is: does it display l

But, you can get all of these things from HTML. Especially visual hierarchy and accessibility. The cornerstone of accessibility on the web is: does it display legibly and is it navigable without any CSS? CSS is eye candy. It's aesthetics. Those are not without value, but the value is not in the things you list.