I’m guessing most Debian users don’t bother.

Why publicly criticize a distro based on a guess that its users are unwilling to use what it offers?

If you’re gaming you absolutely should though.

Well, if your hardware or games happen to need a new kernel or Mesa, then yes. But many do not, so it's not absolute. Also, many gamers get Mesa from Flatpak or Steam instead of their distro, in which case the version provided by Debian doesn't matter at all.

I suggest re-thinking your original comment. It's misleading, and it amplifies a popular misconception.