Not really, because for a native element you're dependent of their APIs. For example the color picker will only use the system color picker, a lot of other native elements are hard to style. So custom elements are often easier to style but harder to maintain and usually bad for accessibility.

"styling on your end" means the _user_ (not the website designer/developer) deciding how controls should be styled and that's much easier if everything uses the same controls because you only need to specify it once and don't need a library to hook all possible UI frameworks that exist.

Users deciding how input controls are styled? Who exactly asked for THAT?

Heard of userstyles?