Not quite. I've run into a gaming case where immutability becomes a problem: Syncthing.

If you want to synchronize emulator saves between devices then Syncthing is great at that, but it takes a lot to get around the immutability without relying on unmaintained flatpaks (aka Syncthing-gtk). At least not on Steam Deck, which doesn't have Syncthing baked into the main distro