Have you seen a built in HTML date picker? It's horrible and is exactly the kind of built-in uncustomizeable frameworky misfeature that I don't want in HTML / CSS.
Tables are just unstyled boxes with an alignment rule. Not very high level.
Buttons are provided by the host OS, HTML and CSS have nothing to do with their default style or behaviour, and if you start styling them you basically revert to working from unstyled boxes.
Absolutely, I agree that it sucks. And that's why UI developers are building all sorts of DIY components, too many of which fail. But that's exactly my point.
Tables are just unstyled boxes with an alignment rule. Not very high level.
Buttons are provided by the host OS, HTML and CSS have nothing to do with their default style or behaviour, and if you start styling them you basically revert to working from unstyled boxes.