my guess would be so they don't have to create 4 or 5 different tutorials to bring the player through.
If you have a small campaign with 5 somewhat similar factions, it's easy to create a tutorial that will cater to them all...and then you can put very small amount of work required to open the rest of the factions. That way they don't break their fingers making useless tutorials for all the varied factions, for the new people, and can concentrate more on the actual game itself.
that would be my guess on why they leave some locked....but what do i know.
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