In any dynamic world (a term which encompasses all games, including eu2) you run the risk of making it more unaccurate the more you create exceptions to the rules which govern it (events).
Every time there is an exception you create an anomoly which may or may not actually distort accuracy (even though the intended effect might just be the opposite). That said, I haven't even played eu3 and I'm sure some of the mods make it more historical. But in a way you are allways "weakening" a game with more events and special rules and such.
Not sure I made myself clear at all here actually
But this is what I learned from modding civ 2 back in the day, there was actually a retro trend of leaving more and more up to the game engine after people tried to controll too much with events and exception rules.
Every time there is an exception you create an anomoly which may or may not actually distort accuracy (even though the intended effect might just be the opposite). That said, I haven't even played eu3 and I'm sure some of the mods make it more historical. But in a way you are allways "weakening" a game with more events and special rules and such.
Not sure I made myself clear at all here actually