> Everything built on top is up to the implementation developers.

and that's exactly creating the problem: Window management for example is left as an excercise to the reader. thus (my point above) the WSLg interop for graphcial applications _sucks_ compared to where X Servers already were. and if MS doesn't implement what's needed, it won't come. no way to fix it in the Linux or on the Windows side. the MS Wayland thingie in between tightly controls what is possible.