I just tried GZDoom from Flathub to try to see if these things were there, because they weren’t last I checked (which was admittedly a long time ago). The game couldn’t find my WADs after a few tries of trying to get it to work, even after using Flatseal. Flathub reviews indicate that those who managed to get it running were having trouble getting the game to recognize their controller. The Steam version just works. Having community source ports is great, but there’s value in the company updating their official version.