In view of the historical correctness, wouldn't it be better to enable the recruitment of high developed units from the beginning - at least in all capitals? And capitals should have all buildings built (well, exept those which weren't built 272 BC of course)*
For example, Sparta already had Spartan Hoplites as Soldiers 272 BC, didnt they?

*I think I've read that public Thermae came up in Rome after the defeat of Varus, so way later then EBs era. Wrong or right?