It is rare to see a game get this wrong, the last one I saw was a Borderlands. If you look at a game’s Steamdb cloud listing, they list Windows’s save location, and then Mac/Linux saves are expressed as a rewrite rule.
Cloud saves on PS are handled quite simply - if you didn’t pay for your very own PS Plus then go fuck yourself. I have lost dozens of Aloy hours on my brother’s PS4.
Sometimes when I go into Desktop Mode, X11 doesn’t have any screens. The deck just sits there with a black screen, until I ssh in and kill plasma