All Linux is gaming Linux with Steam installed.
That's true. With the way things are often talked about, you'd think that there's certain Linux distributions that were "made for" certain tasks or are "the best for" certain tasks, but that's not
really the case. You've really got three base distributions of Linux - Debian, Arch, and Red Hat/Fedora, and the only really important difference between them is which package manager and base repository they use to deliver software. Every other distro out there just takes one of those three and adds particular things to it, and I would guesstimate that like 80% of those things are aesthetic.
The particular things a distro adds
can be geared toward a particular task, but all that really means is that you'll have certain tools pre-installed when you first install the OS. Any other distro still has access to the same tools, you'd just have to take a few extra seconds and install them yourself. Like, Bazzite calls itself a "gaming distro" but it would take maybe 15 minutes or less of downloading and installing stuff and changing system settings to make literally any other distro capable of everything special that Bazzite is capable of.