I have a media center managed with Kodi, which is completely controlled with Kore on our Android smartphones : Wake On Lan, browsing music collection, etc. It means we do not have keyboard and mouse on this computer.
So since gnome 40, Kodi is not displayed fullscreen. Instead it is shown through the “Activities” view.
I hope that this argument will support making this behaviour changeable through an option. Or at least disabled when a graphical application is launched at start-up.