So the solution is to build applications around less of a common base? I don't follow the logic, with respect to Zed. I get what you mean if there's a first-party UI solution in your language (e.g. Swift), but in that case you don't need an open-source UI library.
replyThe solution, if you want a production ready GUI, is to use a GUI toolkit which already has decent accessibility support.
replyThere aren't that many of those: .NET, AppKit/UIKit, SwiftUI, Qt, GTK, the web, wxWidgets (which is really just GTK/AppKit/.NET), probably a couple others. So you either use the native language of one of those toolkits, or you use bindings from your language to those toolkits.