The point you are missing however is that we cannot reproduce an attack like D-Erlons! Or at least I cannot and I have yet to see anything near that on any video
I'm not 100% sure yet, but I think we may be seeing it in most battles, but it's not like we expect it to be. Waterloo was a very small battlefield compared to other major Nap battles and the troops were very packed together. I don't remember how many Battalions there wer in total, but if I re-call they attacked in four large Divisional Columns, I bet there is a way to re-produce that in LG, but I don't know how - yet.
and the statements of senior Napoleonic commanders, who commented that they had rarely seen more than half a dozen battalions (or squadrons) engaged at one time
I agree with this, it's the same in any period of warfare, if you read about Normady it might say the x and y divisions attacked between a and b....but in reality it was only perhaps a few battalions from each division in the front line leading the attack. With others behind to take over and other further behind in reserve, not EVERY battalion in the Division all went charging off from the start line at the same time. Same thing at Kursk, the German Panzer divisions never had every last man and tank in the front line all attacking ay once.
A Divisional Command would be a good addition in the future - perhaps, but by then we might all have gotten used to the Corps Command and worked out how to use it correctly, so it might never be needed anyway.
There will also be a big difference in the full game when the Corps could be a LOT bigger, in the demo some of the Corps are not that large. How about putting two large Corps one behind the other and giving them a deploy order behind the enemy, what would happen then I wonder ?.