Can a fantasy people plausibly live entirely aboard ships without any home ports?
Short answerYes, if the setting explains how a mobile fleet supplies production, repair, trade, protection, and every other function normally concentrated ashore.
NotesThe panel accepts a portless maritime society when the fictional setting supplies a credible mechanism for sustaining it. Magic can close some gaps in fantasy, while science-fiction examples use enormous trading fleets that exchange with planets but rarely settle on them. Such a population still requires food, raw materials, manufacturing, repair yards, governance, and enough warships to protect the civilian fleet. The useful design lesson is that mobility does not remove infrastructure; it forces every indispensable service to travel with the society or remain reliably accessible through trade.