It’s been suggested, it’s been denied.
Ast is a pain and doesn’t always work. Skull is a lightweight command. The main reason (I believe) that /skull was rejected in the past was its possible use in survival would destroy the head shop thing in the admin shop. That shop is nonexistent as of now and I don’t think enough people actively play survival to make this worth keeping the command blocked.
Additionally, the argument that the headbank covers head needs is kinda crazy too. Our headbank has a (to be honest) tiny selection and is already laggy. My project to build a headbank is also riddled with lag. /skull would let people get the heads quickly and easily without having to use the occasionally working ast (or in the case of members, asking some with ast to get a head) and would generally just be a helpful tool.
PCB is a building server after all, no point in making getting the materials harder.
Currently investigating this suggestion. Will post a response in due course.