While technically true, that is a bit of deflection. In some cases none of the compositors have implemented certain things yet.

My biggest issue with gnome is that it doesnt remember where my windows were last time I ran an app. Someone over in way-land probably should have told them that would become a their-problem so it could be addressed it sooner. Same with window decorations, they should be handled by the compositor IMHO. Sometimes a new thing should come with recommendations for use.