[troupo]

You do, due to accessibility in certain contexts. E.g., filling a form should really be a modal (e.g. on a site or in apps catering to the elderly) so that the focus doesn't stray away.

But there are very few situations where you'd need a modal.

[oneeyedpigeon]

In that situation, what is the benefit of a modal versus a full page that only contains the form?

[chownie]

Modals are almost always atrocious experiences for screen reader users though, so not sure if that tradeup is worth it.

[troupo]

No idea how screen readers work for native modals, but on the web I'm not surprised: it's very hard to make a proper modal (with proper focus, keyboard trapping etc.) on the web :(