This is also true, and as such it would seem that the 'soft-lock' option is the answer here with regards to movement.
Yet to see a source that says the lines and formations were perfect and if we are going for realism you will need some sort of Natural movement when in formation. The grid means the player has to work a soft lock takes away player involvement to me. That's my penny's worth on it
sig courtesy of MadWolf 42nd Pen
Jesse S. Crosby, 20th Georgia Infantry, July 15, 1861 - May 6, 1864
Samuel T. McKenzie, 20th Georgia Infantry, July 15, 1861 - September 2, 1862
Joseph C. McKenzie, 20th Georgia Infantry, July 15, 1861 - October 1, 1863
Henry C. McKenzie, 3rd Georgia Infantry, June 1, 1861 - January 28, 1863
Charles R. Beddingfield, 38th Alabama Infantry
Samuel L. Cowart, Cobb's Legion
In real life you would be able to speed up a tiny bit, or slow down a tiny bit. The human body has an infinite number of different movement speeds.
Then there lag and differences in ping to consider. Also if one soldier presses their W key a fraction of a second later than his neighbour, he's behind. The current movement system only has three different speeds which are pretty far apart. Add to that things like not being able to really touch shoulders to determine if you're still in the right spot, lessened field of view (no peripheral vision) and it all becomes very difficult, even for the best drilled, to stay in formation.