Accessibility is not black and white. I have good vision, and native date pickers as implemented in all desktop browsers, are so tiny, I have to zoom the page every time I encounetr them.

> If you roll your own, you can't cater to people with disabilities that you haven't considered.

True, but you out of hand dismissed huge swaths of people who are not using "adapted user-aganets" but still suffer because browsers have a shitty native implementation.