Why are we concerned with historical accuracy? Samurai vs Arabic cavalry? Milanese plate vs wedding dresses? Side swords vs viking gear? cRPG is the Deadliest Warrior Online.
+1 on the Roman stuff. I study classics and it would be fun to get a couple classmates and play a few rounds with Roman gear. This does highlight, however, the need for a short-range stabbing animation for short swordsman while they're also holding a shield. Roman tactic, sensible tactic, and what's most missing from 1h combat IMO.