All desktops use the Super key nowadays. Sway, i3, GNOME, Plasma, etc. are all using the Super key. Have been for years. The standard convention is that the Super key is reserved for system-level shortcuts handled by the window manager; and Alt key shortcuts are reserved for application-level shortcuts. Your desktop might have bound both Alt and Super because of legacy reasons.
All desktops use the Super key nowadays. Sway, i3, GNOME, Plasma, etc. are all using the Super key. Have been for years. The standard convention is that the Super key is reserved for system-level shortcuts handled by the window manager; and Alt key shortcuts are reserved for application-level shortcuts. Your desktop might have bound both Alt and Super because of legacy reasons.
Oh TIL, thanks