maxleod: Do the GOG installers work out of the box on Rocky, or does it require tweaking?
If you mean the so-called Linux-installers of GOG games, frankly I don't know as I don't use them even in Linux Mint (I tried the Two Worlds Linux installer in Mint, and in the end it was less of a headache to get the Windows version run in WINE... and I think the "Linux version" was just that, the Windows version wrapped into WINE or something).
Ubuntu (or Mint) is more foolproof both for GOG and Steam gaming as I think Ubuntu is what Steam and GOG target to. RHEL-derivatives may need some extra work or workarounds, case by case. I presume though that setting up WINE and running Windows apps/games with it is not really harder in RHEL than in Ubuntu (I haven't actually tried this yet on Rocky, only in Mint).
For instance installing the mere Steam client in Rocky Linux needed more research. In Linux Mint and Ubuntu, you just head to www.steampowered.com and start the Linux client installation from there.
With Rocky 9, I googled and found some instructions that by default Rocky Linux is missing some dependencies that Steam needs, and there were rather convoluted instructions how to get those dependencies to Rocky from some other Linux distro. (?)
However, then I found alternative instructions that there is a flatpak-version of Steam available, and installing it was simple and straightforward, It works great too, but there is a slight audio problem at least in Team Fortress 2, I can't hear some of the announcement sounds (the female announcer who e.g. counts down the start or end of a round; some of her announcements still work though?). I don't know if I have some wrong setting or what is the problem, but for now that is not a biggie. Not sure if I noticed any similar issues in Portal 2...
My next task for Rocky Linux is to install WINE, maybe Lutris, to play some GOG games. I admit Steam has an upper hand here, when you have set the client up, installing and playing Steam games doesn't really differ from the Windows experience (for those Steam games that support Linux).