I think it is a reasonable question. As to the difference in time, we can look back at the Joint Committee on the Conduct of the War for a written record how they felt the war should be fought (for the Union anyway). They collected copious notes over their tenure many of which have been helpful to historians over the years. It spite if their resources, they were often criticized as being misguided and ill informed. They often leaked information which made its way to the newspapers - intentionally and unintentionally. They had political bents that shaped their recommendations, but so did battlefield generals of that day and probably today as well.
They pressed Lincoln for the removal of McClellan early, although he did not act immediately on their recommendation. I think they did some good things, like looking into corruption, trade and prisoner treatment. That was their realm and they should have stuck to it.
As for the average Joe who comes to this site a few hours a week, myself included, I think many of us are fooling ourselves if we think we would have acted differently or could have done better than these Generals and commanders. What we know, and what actually happened, I think are two very different things. Being in the moment, with all that smoke and confusion, and limited communications, and carnage is quite another matter. After 1st Bull Run, few congressmen ventured near the battlefields. Witnessing carnage in itself can make someones mind go into a tail spin.
There is a reason we have the term Monday Morning Quarterback. It is silly to think because we watched a football game we could have done better. Its fine to make observations on a game or a war, but to think we could have done better without ever being in anything akin to that situation, is kind of silly.