In case of the convergences and ammo beltings, what is able to do so in other sims, it is a nice feature, but in most cases it is unrealistic.
95% of all planes used the same yard setting, and ammo belts, in the hole wartime. In CLOD you have the fantastic ALL AP or HE ......etc, option, this was never the case in RL, there was always a mix of it. Made in the factory, and what was aviable at the time.