pipewire-media-session.service is no longer installed. You must switch
to wireplumber.service user unit before your next logout/reboot:
systemctl --user disable pipewire-media-session.service
systemctl --user --force enable wireplumber.service
Switch to WirePlumber will happen the next time gentoo-pipewire-launcher
is started (a replacement for directly calling pipewire binary).
Please ensure that ${EROOT}/etc/pipewire/pipewire.conf either does not exist
or, if it does exist, that any reference to
${EROOT}/usr/bin/pipewire-media-session is commented out (begins with a #).
WARNING: you have enabled the system-service USE flag, which installs
the system-wide systemd units that enable WirePlumber to run as a system
service. This is more than likely NOT what you want. You are strongly
advised not to enable this mode and instead stick with systemd user
units. The default configuration files will likely not work out of
box, and you are on your own with configuration.

pipewire-media-session.service is no longer installed. You must switch
to wireplumber.service user unit before your next logout/reboot:
systemctl --user disable pipewire-media-session.service
systemctl --user --force enable wireplumber.service
Switch to WirePlumber will happen the next time gentoo-pipewire-launcher
is started (a replacement for directly calling pipewire binary).
Please ensure that ${EROOT}/etc/pipewire/pipewire.conf either does not exist
or, if it does exist, that any reference to
${EROOT}/usr/bin/pipewire-media-session is commented out (begins with a #).
WARNING: you have enabled the system-service USE flag, which installs
the system-wide systemd units that enable WirePlumber to run as a system
service. This is more than likely NOT what you want. You are strongly
advised not to enable this mode and instead stick with systemd user
units. The default configuration files will likely not work out of
box, and you are on your own with configuration.