But they were the frequent sites of Roman internal wars during the Imperial era. If it was a specifically military tech, it should show up all over the Roman military world, the way patterns of armour and weapons also proliferated Empire-wide. After all, the legions themselves were mobile - A legion might be raised for a war in Dacia, participate in suppressing Judean revolts, be stationed in Egypt, campaign in Syria, then off to fight in Germania and end up back in Egypt. Their supporting tech would be the same.