Pipewire and Wayland development have gone hand-in-hand for a while now. Mainly - Pipewire is compatible with the security and isolation requirements wayland places on apps, and Pipewire is far more than just a replacement for pulseaudio.

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Here - to quote the debian wiki (https://wiki.debian.org/PipeWire):

"PipeWire is a server and API for handling multimedia on Linux. Its most common use is for Wayland and Flatpak applications to implement screensharing, remote desktop, and other forms of audio and video routing between different pieces of software. Per the official FAQ, "you can think of it as a multimedia routing layer on top of the drivers that applications and libraries can use."