DataDrake
I obviously tried a few different mic+soundcard combinations before concluding Discord is just not that good (for my tried options). Ripcord for some reason just sounds better.
(also, on Windows it's fine, hence the 'Are you currently on Windows?' comment)
This is all based on my friends' responses, so obviously I cannot be 100% certain they are wrong in their experience with my voice clarity.
It's just annoying as all these sound issues more or less convinced them that Windows is just way better than Linux in everyting, even if in the end it's not linux, but a shitty app that causes it.