Historical Attrition means the affected player/AI will suffer attrition even when stationary and that entire elements may be replaced only in a Depot, so that their parent unit must repair at a depot to recover them, and be detached from their parent stack to do so. This system makes sense for prior centuries, but does the Historical Attrition option make sense for the Great War?
Trench line fronts units could be and often had to be reinforced, and this might be done in position, or by rotation, or local retirement or reserve status for the unit, or refit farther away, but these might well be within the same EAW game region. It doesn't seem reasonable for every frontline region to have a depot - they cost time and resources but are easily torched.
One thing in favor of physically detaching units from a stack and moving them back and forth to depots is that the AI should be able to manage this more thoroughly and with more administrative efficiency than the human player (who definitely takes more time and effort in small regions with lots of troops), providing a slight edge, although I hope the human has better judgment as to what is situationally desirable.
Certainly moving units in and out of the line can generate mistiming of movements that creates risks for the armies and opportunities for its opponents.
So tell me, is it the right feel? What do you think about Historical Attrition?