The xdg-desktop-portal stuff is still too immature. For example, my friend wanted my help after upgrading his Pop_OS to 24.04, and 24.04 replaced GNOME with COSMIC. COSMI had no RemoteDesktop portal (and still doesn't have it), so we couldn't use RustDesk like we always did without him installing a GNOME session just for that.

I've been an i3 user for almost two decades, but eventually switched to Sway - to this day there's no InputCapture portal, so I can't use Synergy with Sway, forcing me to switch to i3 while I'm working.

It's been over 10 years of things like that. There's always SOMETHING missing.