It is always about choices.

ArcoLinux runs in 2021 on Pulseaudio. Alci has no sound at all. Why not give Carli pipewire?

In order to enjoy music I like to have my bluetooth headset available so we explain how to add services.
It could be any other service like printing, avahi, … The workflow is the same.

See what happens to the content of your /etc/systemd/system if you enable the service and put the same files on your iso (airootfs).