There is always a balance between gameplay and realism in any game. On one end are game such as Call of Duty, purely for fun with little resemblance of reality. On other end are simulation game. Believe me, Total war games are by no mean that hard-core. There are games such as Bus simulator, train simulator, agriculture simulator (no joke) where you scratch your head asking yourself: where's the fun in that. There are games such as flight simulators with hundreds of page of manual. Total war games are always very straight-forward with no steep learning curve. But I digress.
Games are first and foremost for fun. For Total war fans, many if not most of them also history fans, realism means fun. There is nothing cooler than seeing things that you read in history book actually coming to life. Of course, people's history knowledge varies: there are people (I dare to say the majority) who are content with knowing Carthage was arch-enemy of Rome and Alexander was a gay (a tasteless joke of me

). Others, often much fewer in numbers, known by heart what kind of bread Romans ate for breakfast. There is a German idiom which says: "To satisfy everyone is an art which no one masters". CA has to make their choice. Going too much for realism is 1. expensive, 2. time consuming and 3. unnecessary if not even bad for gameplay. Going too much for gameplay and the forum will be flooded with thousands of complaining threads. I myself cannot imagine the situation when RTW is released in 2013 instead of 2003.
Anyway,seeing all kinds of whinners wasting their times writing walls upon walls of text is sometimes very entertaining. It kinda reminds me of my old day where I tried to persuade my friends that gatling gun and katana are actually very bad weapons against zombies, then they looked at me with a smirk and said: Who cares?