[onion2k]

Responsive design isn't just adding breakpoints.

It's responding to the device and the ways the user will interact with it. For example, the combobox example in Evergreen doesn't actually use a <select> in the background, so users on mobile devices will actually have to use the dropdown implementation rather than the browser displaying a proper native mobile select. That's a much worse experience. Not to mention Evergreen will be completely inaccessible for users who need assistive technology, which potentially poses legal issues...

[statictype]

Did you try it on mobile? It actually does seem to use the native selector and not the custom one for me

[onion2k]

I did, and it doesn't on my Android phone.