Thanks for pointing out that in this case the DM is using X regardless of whatever graphical environment gets loaded when the user logs in. This really is a moot point/discussion. I’m still glad I raised it to get perspectives like yours.
You’re right that I should play around with wlroots a bit more. It’s been a while, personally. Mostly because it’s been a while since I’ve had time to just play around with my system. My life is at a point that it looks like I’ll have that free time soon, for better or for worse.
I’ll note that I do like alternative init systems for diversity and competition and because systemd was very hungry and rigid. An init system is also a bit more fundamental to system stability than a display server, so I think it’s reasonable to be critical of systemd and Wayland for contradictory reasons. Systemd has also come a very long way in the past decade plus. I have also seen it learn from the other ideas implemented in its competition, mirroring your argument. Diversity and unification are not at odds with each other, but are different parts of the same cycle of improvement.