All I know is wine-mono and wine-gecko doesn’t come in any default package lists on apt that you get on Linux Mint (which should include Debian and Ubuntu packages), not sure if they exist on some other mirror list somewhere but it didn’t seem like it, while on Arch I got them directly from Extra (not even AUR).
Well you technically don’t need mono or gecko, especially not if you’re just going to use Steam Proton to play, but I use pure WINE a lot and it was a pain having to install them manually. Eventually I gave up on using mono and just downloaded the .net runtimes I needed through winetricks.
There were also some lib32 package I got from AUR on Arch that didn’t exist on apt. One of those gst plugins (ugly/good/bad/nice/whatever)