So, what you're ultimately complaining about is the lack of a standard API for creating window managers and the like - the X11 protocol includes this, the Wayland protocol does not. But this doesn't stop you from using the API provided by specific Wayland implementations to create a WM, and the ability to innovate on just this aspect without touching the rest of the protocol should make it a lot easier to create a good WM API. Yes, you have to choose the architecture/API of one of the existing implementations, or write your own. But this is much better than having no choice, and being forced to use the X11 protocol!