Pulseaudio is one of the absolute best parts of Linux.
Have fun routing audio from one stream to one device and another stream to a different device on Windows or macos!
Have fun routing audio from one stream to one device and another stream to a different device on Windows or macos!
I can do that with pulseaudio, but it's not fun.
I'm quite sure this process starts with me writing some config files on both of these computers. That's how it worked every other time I've tried these sort of things with Pulseaudio. These sort of tricks are possible for techies to do with Pulseaudio, but for the proverbial grandmother user they may as well not exist because the system as a whole certainly isn't going to make it easy.
So don't be so sure ;)
You just tick a checkbox in paprefs to enable networking (which is perfectly reasonable, as in most cases you don't want to have it enabled by default), and that's it. It finds the other PC via zeroconf and it shows up as a regular output device.
Depending on distro you use, you may need to install PulseAudio's zeroconf module and make sure Avahi is running, but a properly configured desktop distro will have all that either by default or a single package installation away these days.