[another-dave]

Isn't the better solution for the browsers to collectively improve them in that case rather than ditch them & every site roll their own (with custom styles and the over-the-wire weight of the code to implement it)

In your opinion, what's terrible about these from a UX perspective? Is it just the styling or something else?

The alternative to a default confirm prompt is going to be someone including Bootbox in their site, which I'm not sure how that's much better