Yes, a quick web search later I haven’t found a readymade solution.
Setting the volume for specific outputs is not very hard, so maybe a middleground solution is to have two shortcuts. One for “game mode” and one for “music mode” or whatever.
The details depend a bit on the audiostack of your distro, but they all have a cli program with which you can change inputs/outputs and volume; e.g. pactl for pulseaudio and wpctl for wireplumber.
You’ll need a mechanism to find your triggers (I create a firefox tab with youtube/spotify, I have a music player active) and then you can act on it.
Detecting voice in an audiostream is probably technically possible, but that sounds pretty hard to setup.
IIRC, within RHEL it goes fedora (next major) -> centos stream (next minor) -> RHEL (current major.minor).
With Debian and its derivatives (e.g Ubuntu) this means that Debian-unstable corresponds to fedora, Debian-testing corresponds to CentOS stream and Debian-stable corresponds to RHEL. (Roughly of course).
Ubuntu is based off of some flavor of Debian and is therefore downstream of it: Debian (unstable I think) -> Ubuntu -> Ubuntu LTS.
But as far as which version has the newest packages then sure, your list is correct.
Yes, whoops.