Does EB use the same ERE/WRE rebel factions that BI had? I haven't played BI myself, but reading about the system it seems perfectly cut for the Seleucid and Ptolemaic empires who did have many trouble subduing seperatists because of the sheer sizes of their empires. It would also add some more challenge, because the Seleucid are in a vastly advantagous position due to their many rich provinces.