I don’t use Sid, but testing, it’s working almost flawlessly. Each release (once every 2 years, I guess), I take few hours to check everything work; remove shader cache, etc.
My setup, right now (dirty, for authenticity) :
<span style="color:#323232;">$ cat /etc/apt/sources.list
</span><span style="color:#323232;">deb https://deb.debian.org/debian/ testing main contrib non-free non-free-firmware
</span><span style="color:#323232;">deb-src https://deb.debian.org/debian/ testing main contrib non-free non-free-firmware
</span><span style="color:#323232;">
</span><span style="color:#323232;">deb https://security.debian.org/debian-security/ testing-security main contrib non-free non-free-firmware
</span><span style="color:#323232;">deb-src https://security.debian.org/debian-security/ testing-security main contrib non-free non-free-firmware
</span><span style="color:#323232;">
</span><span style="font-style:italic;color:#969896;"># bullseye-updates, to get updates before a point release is made;
</span><span style="font-style:italic;color:#969896;"># see https://www.debian.org/doc/manuals/debian-reference/ch02.en.html#_updates_and_backports
</span><span style="color:#323232;">deb https://deb.debian.org/debian/ testing-updates main contrib non-free non-free-firmware
</span><span style="color:#323232;">deb-src https://deb.debian.org/debian/ testing-updates main contrib non-free non-free-firmware
</span><span style="color:#323232;">
</span><span style="font-style:italic;color:#969896;"># add by me
</span><span style="color:#323232;">deb https://deb.debian.org/debian/ testing-backports main contrib non-free non-free-firmware
</span><span style="color:#323232;">deb-src https://deb.debian.org/debian/ testing-backports main contrib non-free non-free-firmware
</span><span style="color:#323232;">
</span><span style="color:#323232;">$ cat /etc/apt/sources.list.d/</span><span style="font-weight:bold;color:#a71d5d;">*
</span><span style="color:#323232;">deb http://download.opensuse.org/repositories/graphics:/darktable/Debian_Testing/ /
</span><span style="color:#323232;">deb </span><span style="font-weight:bold;color:#a71d5d;">[</span><span style="color:#323232;">signed</span><span style="font-weight:bold;color:#a71d5d;">-</span><span style="color:#323232;">by=/etc/apt/keyrings/lutris.gpg</span><span style="font-weight:bold;color:#a71d5d;">]</span><span style="color:#323232;"> https://download.opensuse.org/repositories/home:/strycore/Debian_Testing/ ./
</span><span style="font-style:italic;color:#969896;"># Uncomment these lines to try the beta version of the Steam launcher
</span><span style="font-style:italic;color:#969896;">#deb [arch=amd64,i386 signed-by=/usr/share/keyrings/steam.gpg] https://repo.steampowered.com/steam/ beta steam
</span><span style="font-style:italic;color:#969896;">#deb-src [arch=amd64,i386 signed-by=/usr/share/keyrings/steam.gpg] https://repo.steampowered.com/steam/ beta steam
</span><span style="color:#323232;">deb </span><span style="font-weight:bold;color:#a71d5d;">[</span><span style="color:#323232;">arch=amd64,i386</span><span style="font-weight:bold;color:#a71d5d;">]</span><span style="color:#323232;"> https://repo.steampowered.com/steam/ stable steam
</span><span style="color:#323232;">deb-src </span><span style="font-weight:bold;color:#a71d5d;">[</span><span style="color:#323232;">arch=amd64,i386</span><span style="font-weight:bold;color:#a71d5d;">]</span><span style="color:#323232;"> https://repo.steampowered.com/steam/ stable steam
</span><span style="color:#323232;">
</span><span style="font-style:italic;color:#969896;"># Uncomment these lines to try the beta version of the Steam launcher
</span><span style="font-style:italic;color:#969896;"># deb [arch=amd64,i386] https://repo.steampowered.com/steam/ beta steam
</span><span style="font-style:italic;color:#969896;"># deb-src [arch=amd64,i386] https://repo.steampowered.com/steam/ beta steam
</span><span style="color:#323232;">
</span><span style="color:#323232;">
</span><span style="color:#323232;">deb </span><span style="font-weight:bold;color:#a71d5d;">[</span><span style="color:#323232;">arch=amd64,i386 signed</span><span style="font-weight:bold;color:#a71d5d;">-</span><span style="color:#323232;">by=/usr/share/keyrings/steam.gpg</span><span style="font-weight:bold;color:#a71d5d;">]</span><span style="color:#323232;"> https://repo.steampowered.com/steam/ stable steam
</span><span style="color:#323232;">deb-src </span><span style="font-weight:bold;color:#a71d5d;">[</span><span style="color:#323232;">arch=amd64,i386 signed</span><span style="font-weight:bold;color:#a71d5d;">-</span><span style="color:#323232;">by=/usr/share/keyrings/steam.gpg</span><span style="font-weight:bold;color:#a71d5d;">]</span><span style="color:#323232;"> https://repo.steampowered.com/steam/ stable steam
</span><span style="color:#323232;">deb </span><span style="font-weight:bold;color:#a71d5d;">[</span><span style="color:#323232;"> signed</span><span style="font-weight:bold;color:#a71d5d;">-</span><span style="color:#323232;">by=/usr/share/keyrings/vscodium</span><span style="font-weight:bold;color:#a71d5d;">-</span><span style="color:#323232;">archive</span><span style="font-weight:bold;color:#a71d5d;">-</span><span style="color:#323232;">keyring.gpg </span><span style="font-weight:bold;color:#a71d5d;">]</span><span style="color:#323232;"> https://download.vscodium.com/debs/ vscodium main
</span>
I play a lot, we just played Grounded with friend yesterday.