While unfortunate, to me this just says any user requested features aren't going to get merged anytime soon. As is, it already runs on windows/linux/mac, and will need to do so maturely for Zed to function. Therefore, to me, this isn't that big of a deal, and when they need things like web support (on their roadmap), they will then add that.

I'm curious... does anyone have any PRs or features that they feel need merging in order to use GPUI in their own projects? (other than web support)

I recently saw a PR where the author implemented shaders but it was closed by the maintainers as the feature wasn't needed by Zed the editor.