Yes, that's right, I don't really want Gnome. Apart from that, it probably doesn't run that well on Devuan either.
I use KDE Plasma 5.26.90 with Wayland on Daedalus. Strangely, I get error messages when I start it with X11. When I start it with Wayland, they don't appear.
So far I am quite satisfied. There are minor problems I have with it: The memory requirement is high, but that is more a theoretical problem. What has annoyed me is the clipboard, which I use intensively. I prefer to work with Diodon, because in Diodon I only have to select and click an entry and it is already pasted. I haven't been able to do that with the Plasma clipboard. Then, for example, there are also problems with a black screen, which also occurs in connection with mounting external USB storage devices. I then have to go to a TTY and reboot.
Yes, Gnome is supposed to work very well with Wayland. But -I think- if you want Gnome, you can also use Debian with systemd. Therefore Mate was interesting for me. But that is not yet so far. It's like LXQt. There is also already intensively prepared for Wayland.
Well, I sometimes fluctuate a lot from one to the other. I might just stay with KDE Plasma with Wayland for now.

Some time ago I heard about it. Yes, that is interesting ...

Yes, I see it the same way. Unfortunately, nobody writes HTML in the editor these days. For many pages that would be enough and it would be better for the eye and orientation than those horrible pages created with CMS tools like Wordpress. If the actual information of a page in the source code is only 0.5%, then something is wrong. This code bloat is sick and it costs masses of electrical energy. We have the same thing with HTML mails. I once read that 1 less nuclear power plant would be needed on earth if everyone composing HTML mails switched to TXT mails.

Yes, exactly. I have also reached that point. Why shouldn't the RAM be used? It is there and it should not be there uselessly. That's why I don't worry much anymore when KDE Plasma consumes a bit more, especially when there is so much RAM. The system is probably intelligent enough.

Yes, but now it would be interesting to know if 3G ram uses less memory than 8G ram or 16G ram or 32G ram.

Yes, it could be. But Gnome causes less problems than KDE Plasma with Wayland and maybe the Mate people got the technology for Wayland from Gnome. Maybe I should just test it.
I'm also not sure if Wayland has been implemented in Mate as fully as in KDE Plasma yet.

This is how it looks here:

$ free -m
              gesamt       benutzt     frei      gemns.  Puffer/Cache verfügbar
Speicher:      15359        1547       13331          36         786       13811
Swap:            979           0         979

Yes, KDE requires a lot. Gnome but even more, I think. In the past, LXDE needed about 300, Xfce4 about 430, LXQt about 400 directly after startup. But as I said, it also depends on which services are started. I used to have KDE Plasma running at about 600 right after startup.
Maybe it has nothing to do with it, but I mean, at least at the same time as the 6* kernel arrived, the memory consumption went up.

Thanks for this! It looks like I'll have to give it some thought. I would be interested in more information on this topic and strategies for improvement.

Yes, I can understand that very well.
Wayland is apparently more secure. By the way, I liked to use KDE applications in LXDE or Xfce. Of course it was also very nice in LXQt. Now I came back to KDE (I started with KDE in 2001 [SuSE 7.2]) because I wanted Wayland and I like the KDE applications. Right now I like it quite a bit.
Have a nice rest of the weekend - best regards
Addendum: in continuous use, however, I now actually notice some problems. For example, the taskbar is gone from time to time, nothing can be inserted from the cache, etc. In LXQt, which I use in parallel on the same computer, these problems do not occur ... but there again I have no Wayland

With Daedalus (descended from Bookworm) it is available.