I agree with a caveat: Default date pickers on mobile devices are very good. But on desktop browsers they are terrible. They break design continuity in a very ugly way and have quirks between browsers and systems. And personally, the popup calendar they provide just too small. If the system took over the date picker on desktop like it does on mobile devices instead of forcing the browser to handle it, I feel like we could get somewhere better.

Yes, but having worked on the date picker at Airbnb I can assure you almost every custom implementation (probably ours too!) messes up date picking in some region in an important way

> I find that most datepickers are better than the browser's

You mean your browser's. There is no "the browser".

I agree.

The date range selector used in Google Flights is a near flawless control. The implementation can be done, it’s just hard.