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I'm on KDE.
Wallet sync with Android.
Wayland crash recovery.
General support for Wayland screen sharing in flatpack apps.
Swap between KDE and GNOME without restart.
Not for me but selecting different premade layouts for KDE on install.
App by app file backups that integrate with cloud storage.
Context menu of application dock shows Application window settings (otherwise only accessible via main settings or titlebar. (very niche)
Casting the whole screen to Android TV built in.
Option to remove PPAs that error via gui.
Move window to an activity shortcut.
Native support for installing webapps (think Samsung installing a website) so I don't have to use a separate browser window or an unsecure electron package.
But if I'm being completely honest the amount of use cases I have that are covered by KDE is completely insane. These are the ones I want for "1-2 times per day saves 10 seconds" or "1-2 times per montt saves a minute + standing up". If it were not for these I'd have to list "Interact with my IoT devices via laptop and KDE connect to make me coffee without standing up". Love KDE.
Swap between KDE and GNOME without restart.
It's easy on lighter on DEs like XFCE or Sway, by using TTYs. Press Ctrl+Alt+F3, Ctrl+Alt+F4 etc. and start the DE with their start command (like startxfce4).
On KDE or GNOME it should be too, but I haven't figured it out yet.