There is no need to use “old” distros. Xorg is not going anywhere on Arch.
It does. The problem is KDE, it has no implementation for screensavers.
You are looking for Wayland extra protocol “session lock”
A surface displayed while the session is locked
The client may use lock surfaces to display a screensaver, render a dialog to enter a password and unlock the session, or however else it sees fit.
It’s true that a screensaver would increase the wear, even of pixels that have already been degraded, but this can still be desireable.
An OLED screen that has begun to exhibit image retention is like a wood board that is becoming scored in places. Sanding it would objectively cause wear to the entire board and thus all the pixels, including dimming even those that have begun to dim further, but it equalises the overall wear iff we can assume that degradation is not linear. I don’t know enough to say for sure, but I would imagine that it isn’t.
The screen is objectively worse off by using screensavers, but any image retention is less pronounced.
idk, the wood sanding analogy is not the best, screensaver would still increase wear on those pixels, wouldn’t equalize much even if we you run a truly random screensaver.
To have “sanding” effect you would need to play back the inverse colored pixel perfect video of the session you just did.
Just use dark mode where you can and turn off your screen if idle.
Screen lock and screen saver are not the same thing. 
Yes, what you say is true but only if we assume that degradation is linear. Is it? I don’t know.
I have no idea, screensavers are so 2005
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