The game is based in medieval England, The English do not run around on a fully armored horse with poncy bows.
However, I think the massive battles thing should be added for realism and more fun.
As for the realism: What was meant in "massive"? It wouldn't be that real, to let thousands of players hackin' and whackin' at each others. Even in the times the game is set iron was a rare luxury. It would be for realism if the developers let -say- about 200 people clash on each other in a let's call it Great Battle. For smalelr skirmishes a number of 50 might be appropiate... - though some might call even 50 "massive"...o.ô