Of course it comes installed so you can listen to audio. That isn't what Soundsource does - you CAN make Pipewire work like soundsource, though. Of course my post is biased. I gave my opinion as someone who uses both vs someone who only uses linux and doesn't know osx. Any Linux user telling me that "Linux does more than OSX" is getting my biased reply.

Per app audio redirection, per app effects, per app volume control, system-wide effects, headphone equalizer, auto change inputs/outputs etc. I haven't worked with pipewire in a long time but I had to use another app with some complicated GUI of "wires" or pipes to get the same affect. I can't remember the name of it now.

edit: Wireplumber or Mixx/Raysession, I forget. It was a huge pain comparatively.

Mixx - https://canada1.discourse-cdn.com/free1/uploads/mixxx/origin...

wireplumber -https://forum.level1techs.com/uploads/default/original/4X/e/...