discord: supports streaming video (webcam or screenshare) but not audio (aside from your one mic). I sometimes use qpwGraph to pipe the audio of an app I’m streaming into my mic mix. It sucks that my friends can’t adjust the volume of it separately from me, but it also sucks that everyone uses discord.
clipping game video+audio and discord audio: I use OBS replay buffer with jack audio nodes to capture the last 1m of gameplay along with separate audio channels for the game I’m playing, my own discord audio, and the audio of anyone else in discord.
So I get pretty good use out of qpwGraph, but sometimes it seems to interact in non-obvious ways with wireplumber I think.