Thanks for taking the time writing this up, it is very helpful for my understanding (and I imagine many others’ as well)! For the things I don’t completely understand for now, this also gives me a lot of additional pointers for what to learn more about to get a better grasp. So it goes straight into my notes for future reference.
Sounds like I should dare to activate my dGPU and reboot to check it out now then :) My biggest worry was that it would be so severely broken that I wouldn’t be able to switch back, but I know that is just an irrational fear - no way Tuxedo would’ve switched to Wayland by default if it broke their own laptops. But I’ve been a little twitchy about larger updates since I deleted KDE accidentally from not properly reading/understanding the prompts during update.
Not an answer to your question, but a (perhas naive) question itself: are keyloggers impossible on Wayland?