In case it needs to be said (again)...
I apologise for being overly enthusiastic in my posts.
I can become overly optimistic about my capabilities and bite off more than I can chew.
Turns out I'm subject to hallucinating as much as AI.
Now that I have my game running great under ZorinOS Wayland, I'm actually spending a lot more time booted into Wayland. ZorinOS is so polished as a distribution.
Inspired by Hyprland, I've tweaked the ZorinOS desktop to my liking and it is quite beautiful in a simplistic way.
Clean and functional are the words that come to mind.
Steam on ZorinOS Wayland
I've settled with running Steam in "small mode" so none of the problematic (Chrome Extended Framework) web elements are exposed. I can use my web browser for looking through the Steam store.
The problem is that Valve is using an older version of Chrome Extended Framework (CEF) with a flickering bug that isn't fixed until a later version of CEF.
Whilst there could be work-arounds for it, Valve hardcoded the graphic settings for CEF which results in overrides being ignored.
Wayland Gaming
The game continues to run great and smooth under ZorinOS Wayland.
The key is using GE-Proton with the appropriate Proton flags. I'm not terribly sure if my environmental variables make a huge difference as I think GE-Proton does most of the heavy lifting of taming Wayland.
GPU Stats not showing in Mangohud
The fix is provided by @scottyPee : Installing mangohud - #7 by scottyPee
Thank you, @scottyPee 