Freedesktop isn't specifying standards, it just puts out some specs to help interoperability where that is desired but not all specs are expected to be followed

Freedesktop isn't specifying standards, it just puts out some specs to help interoperability where that is desired but not all specs are expected to be followed and really anyone can propose new specs. It is even in their site: https://www.freedesktop.org/wiki/Specifications/ https://www.freedesktop.org/wiki/Specifications/ > freedesktop.org produces specifications for interoperability, but we are not an official standards body. There is no requirement for projects to implement all of these specifications, nor certification. Freedesktop doesn't have any sort of authority, while it does provide some useful specs (e.g. the .desktop files are in general useful), not everything they do is like that. The reason that this isn't found in floating WMs is simply that the developers of those WMs didn't found it useful to implement it, not because of Freedesktop (which BTW could update EWMH to include such a thing, it isn't like it has to be written in stone).