The technical merits of Wayland are mostly irrelevant

Excuse me, but BS. At least for anything of actual relevance.

X11 networking works okay for stuff that looks like a classic X11 app. That's things like xcalc. Any modern text editor, web browser, or anything else is going to be dog slow.

X11 has a bad networking protocol that's way too latency sensitive, and as a result is nigh unusuable without something like NX, which puts a local cache in front to get rid of that latency.

No, I'd say X11 wasn't designed to be run on the network, in that no particular care seems to have been taken to deal with latency and bandwidth issues. It's more of a feature that could be had for free, because if you can use an UNIX socket, you can also use a TCP one with minimal work, so might as well allow it.

Case in point: I have to use Wayland, because otherwise my Linux machine just can't reasonably drive my monitors (one 8K, three 4K, and one high-refresh-rate 1440p portable). Upon logging into any modern Linux, like Fedora or Ubuttnu or whatever, X will freak out, jank out with its crank out, and -- only if I am lucky -- finally show the desktop.

If I want to switch some/all of those monitors to some other computer for a while... good luck switching back.

And there is AFAIK no distro that supports mixed 8K/4K/2K monitors with working font scaling using X.

So I need Wayland for all that. Extremely relevant technical merits, for me. Not maybe for you.

Unfortunately, my workflow also requires being able to do remote desktop, and share my screen during remote meetings. Which doesn't work a blood clot on Wayland yet.

The TL;DR is that both X and Wayland have awful, crippling flaws that prevent pretty basic things from working.

Windows has always been able to drive this same setup, and do all of these things, without problem (on the same hardware). Recently, even Macs (M2 onward) can finally do so. Linux cannot.

So there are two main graphics/HID subsystems for Linux, and neither one works well for modern desktop computing with high-end/new displays.

But, only one of them is likely to someday work well. And it isn't X.

I actually wonder what happens if you run a Gnome app on KDE, or a KDE app on Gnome on top of Wayland, does the title bar look consistent in that case?

I guess I also don't understand why there are even multiple Wayland display server implementations with different feature sets. As if desktop Linux wasn't already fragmented enough.