That's fine, everything doesn't have to look the same everywhere. It does matter when there's functionality a site relies on but it's not available in one out more browser/OS combinations.

Yes, I agree that using the native OS UI is the right choice. Imagine if every web browser had a different file picker dialog, it would be a pain to have to reorient yourself just for that product.

However, I do lament the antiquated Windows 95 color picker. It seems less functional than others that I've used.

Exactly. I want tings to work as defined by the OS I deliberately chose.