Real plans take into account a lot of variables that wouldn't normally come up. Many of the modern plans make assumptions that might not necessarily be justified, such as comparative quality levels, determination, psychological reactions to an assault and such. A lot of these can be a little bit on the optimistic side.
A plan that envisions going up against people very similar to your own, with as much mental resilience as your own people, on their home ground, a people that have no reason to hate or fear you, who you know well because they know you well, a people that you have historically met in battle a number of times before and not only failed to defeat, but who took the battle back to you as far as the White House itself, well, any plan like that is going to be as real as they can make it.