Yeah I used Audio MIDI Setup and it does enable some use-cases. It's still wont let you capture app's audio without 3rd-party dummy device driver and said drivers are buggy mess.
Even Discord offer an option to audio game capture and one of first steps to install is "Disable SIP".
Awesome! Now I can listen to music using headphones while being able to play it through the MacBook speakears at the same time. That'll provide a better social experience of listening to music.
I'm sure there are more uses to be found but that was the most immediate I found.
