Appreciate the reply. Which desktop environment are you using?
My only experience with Wayland is also with KDE. Wheres for the 27-ish years before that I've used all sorts of stuff with X.
I've scripted the machine that drives the frontend for our video surveilance ssytem to place windows exactly where I want them when it comes up.
I use a couple of dbus triggers that make the TV on the wall in my garage go to sleep from the shell, perhaps not tested via ssh though. They were pretty well the functional equivalent of some xset dpms commands that I used to use. Not sure if that is what you were meaning. I think I also had something working that disabled the output altogether. I think that was pretty clunky as it used some sort of screen ID that would occasionally change. Sorry I'm hazy on the details, I'm old.
I'll try it all out when I get home, I've got to find some old serial crap for a coworker in the garage anyway.
Agreed, it seems like they should have put just a little bit more in the standard feature set so every little window manager doesn't have to reinvent the wheel.