I guess the other side of the coin is, right now, what is the killer client app for Wayland? If I have an X11 desktop that works for me, why should I bother launching a new compositor plus XWayland, or looking for native replacements for my software?
The sales pitches seem to revolve around the architecture being more secure because random window A can't read random window B (and BTW that means your media player's global hotkeys stopped working). It's hard to not see that as a "the killer is already inside your house, so locking yourself in the linen closet is really effective" perspective.
I can recall looking at galleries in the late 1990s thinking "I really want to get Linux on my 486 clone because I want those awesome window managers". I don't look at what Wayland has to offer the same way.
There are a few compositors lean into the eye-candy mindset (Wayfire comes to mind), but they don't shout out with the boldness of an old Enlightenment release, or even the classic dignity of WindowMaker or FVWM, just some worn-out "let's add transparency and make the windows wobble when you drag them" tropes that were nifty for 10 minutes when we first saw them under X11+Compiz.