Can you clarify what you mean by "these projects never do"? Your comment comes across as dismissive. Especially since I already noted that it was lacking a11y in my original comment.
Anyway although a11y and i18n support have not been implemented, they are planned.
It wasn't meant as dismissive of the project. It's totally fine to write a UI library that has another focus (games, for example). I'm just tired of those projects being suggested as alternatives to native/GTK/Qt in discussions here and elsewhere.
If Iced actually gets cross-platform accessibility support, that's great! Very few projects have that today. More certainly wouldn't hurt. But until it does, you shouldn't base a DE on it.
Edit: The issue you linked to is about RTL support. That's also required, but doesn't touch on a11y.
Anyway although a11y and i18n support have not been implemented, they are planned.
https://github.com/iced-rs/iced/issues/250