> there is basically no way for me to properly debug and solve this problem, whereas solving your problem on Linux would be relatively trivial for anyone with a bit of experience, even if it is in fact a bug in Pulse.
I've never been able to debug any of this. I think "a bit of experience" is putting it lightly. I have no idea how to fix any of this and none of the documentation helps. Imo, between "being configurable but being impossible to configure" and "not configurable except for the most important bits, but at least you get a GUI that makes sense and does what you want and expect", I prefer the latter. I don't want to become a PA developer before I'm able to make it do what I want.
Also, if you dive into the Windows 10 sound settings, you can set the default device and the volume for every application and it'll never deviate from that unless you explicitly change it again. This is how it should be, and I don't understand why PA isn't capable of this as far as I can see.
And if a program deviates from that setting for any reason, the only other reason why it could deviate is because the program itself has changed it, and you just need to check that program's settings. There's two places to check. On Linux? No idea. Infinite possibilities.