You could argue the same thing for Hay or Baktria. Both stuck between Seleucids and another faction. (Sauromatae and Saka respectively)
I suppose Atropatene would have less room to expand however.
Oops I forogot to mention Bosporans in my first post. Oh well, maybe scratching Atropatene wouldnt be such a bad idea.
In terms of keeping the Casse, it ensures that Britain is not a joke to take as the Sweboz or Gallic factions. Historically, you are correct, no tribe united the isle before the Romans arrived. However its addition imo is merited both to make the isle harder to take and also because British tribes did lend money and possibly troops to help their Gallic and Belgic allies during Caesars wars in Gaul.
Also, remember the game is about presenting the situation at 272 and letting everything go from there. What did or didn't happen makes no difference.
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