what typically happens is your user edited one in /etc/ will take precedence over usr/share things,
what typically happens is your user edited one in /etc/ will take precedence over usr/share things, but not sure on this one
systemctl --user status app-steam@autostart.service
systemctl --user status app-steam@autostart.service say?cp /usr/share/applications/steam.desktop ~/.config/autostart/steam.desktopmarked by itself 
systemctl --user status app-steam@autostart.servicesystemctl --user status app-steam@autostart.servicecp /usr/share/applications/steam.desktop ~/.config/autostart/steam.desktopmarked by itself