TODO: the snippet (modify-services %base-services (delete mingetty-service-type))
deletes only the first (tty1) instance of the mingetty service. I can't think of a scenario where this is likely to reflect the user's intention. It should delete all matching services.
A delete-first variant could be added iff there's demand. Kind regards, T G-R Sent from a Web browser. Excuse or enjoy my brevity.