PopOS gaming was a shit show for me, steam wouldn’t work and installing non free drivers borked my system like it was Ubuntu 12.04. I honestly don’t have any idea what PopOS does that others don’t for gaming, steam/wine/lutris/bottles are distribution agnostic. I’ve only ever heard people say PopOS for gaming but never seen anything showing why it’s better.
Full disclosure this was a while ago and I’ve gone separate ways with Debian and derivatives for now.
I’m just back to buying Blu rays. To me it’s the safer option, you legally own your product and you can host everything you want yourself still. MakeMKV is a great tool.