Show me the UI for telling a specific application to redirect its audio output to a specific device automatically. 
  Show me the UI where I plug in a specific device it switches a specific applications (not all) default automatically to the new device.
  Show me it's headphone EQ. 
  Show me per-app headphone EQ. 
  Show me per app EQ settings. 
  Show me the built in 3D/spatial audio for headphones 

Then show me the config file you had to edit to set all of this up. And show me how clean and attractive the UI doing all this is. Then show me it in Pipewire because I don't care about Pulseaudio anyway and would never use that in 2023 with my need for low latency due to my DAW/equipment. Then, in Pipewire, show me how to all this without using Wireplumber or Mixx.

I didn't say you couldn't do things in XYZ. I said the configuration of doing so sucks compared to doing it in another app. Soundsource was just an example. I don't know why you care so much. I could've said Pixelmator (GIMP?) or 30 other apps.

PS: "For all the talk, it should be trivial for you to make me look foolish right now. Like, so easy, right?"

You're this heated up because I like an OSX app more than Linux options? You're acting like I personally care about "winning" this argument. Even if it has these features I still wouldn't use the app. Aesthetics and ease of use is important to my day to day machine. Win the "argument" all you want.