IIRC, Feudalism has similar WW characteristics of Republic or even Democracy. Monarchy, Communism, and Fascist are the only ones without WW. The advantage of Feudalism with many towns is phenomenal unit support. In C-Bob 03, we have over 1000 units we could concievably support for free, and we haven't even came close to making that many. Wars can go very fast with 10 cavalry armies and 50 artillery units, you can win one before WW get out of hand.