I don't know of any case when the pseudo-state "Unspecified" is used. This means that it's always unvisited and therefore provides no information at all.
So it would be nice to hide it from the Workflow tab.
As a bonus, it would be nice to make this tab more useful by allowing admins to configure/tailor and provide more interactivity.
For example: allow to add hyperlinks to states to link to documentation.