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None of the Samsungs I have owned so far had this feature and neither did my last Pixel.
And for almost all the somewhat famous traditional X11 DEs or tiling managers or wms, there is now a wayland compositor mimicking them. Cinnamon and XFCE both have advanced wayland sessions (a recent review of LMDE 7 by distrowatch praised Cinnamon's wayland session as even better than KDE's wayland). They might support X11 for now but it will be increasingly harder to maintain both especially if the majority of their users use the wayland session. This will lead to bit-rotting of the X11 code paths both here and upstream (GTK, mutter, etc).
There are obviously people unhappy with wayland because it has issues with accessibility or automation or other more niche use cases. As hard as it may be, I think the time would be better spent solving these issues in wayland instead. If it cant be solved upstream, downstream protocols like the wlr-protocols can be an option. In fact, even upstream, ext-namespace protocols only require 2 ACKs which shouldn't be too hard to get especially once more wayland compositors join upstream development.
This starts to impact the entire stack as toolkits, mesa drivers, etc. are increasingly developed with Wayland in mind and are simply better tested there. IMO wayback is probably a more fruitful investment than an x11 fork for those who want to run traditional X11 DEs.
I use firefox via flatpak and had no issues so far accessing profile data (in one of the folders in ~/.var/app/org.mozilla.firefox/.mozilla/firefox/ - I keep a regular archive of the entire folder as backup).
yay or paru (or other aur helpers afaik) are not in the repos. To install them one needs to know about how to use AUR in the first place. If you are technically enough to do that, you should know about the security risks since almost all tutorials for AUR come with the security warnings. Its also inconvenient enough that most people wont bother.
In obsidian plugins can seem central to the experience so users might not think much of installing them, in Arch AUR is very much a non essential component. At least thats how I understand it.
The derivatives are obviously completely separate from Arch and thus are not the responsibility of Arch maintainers.