an incomplete Flatpak package is no reason to impose a beta audio server on all users
I suggest you contact package maintainer on Flathub regarding missing dependencies
obs-studio from Manjaro community repository requires pipewire but does not require pipewire-pulse and pipewire-alsa to replace PulseAudio packages
I masked PipeWire systemd units because they do not respect disable command and I use OBS with ALSA, JACK and PulseAudio sources, same as usual
Users who want to replace PulseAudio with PipeWire can install metapackage manjaro-pipewire
But users who find out that PipeWire does not meet expectations cannot revert back to PulseAudio easily because manjaro-pulse does not work and there is no script to deal with systemd units to revert changes from script created for manjaro-pipewire