I suppose that if you're the only marshal involved, planning all on your own without help, no allied around, and there are no enemy troops involved in any of the regions your own troops are in, *then* maybe, just maybe, I could see not necessarily wanting a scout report of the regions with your own troops in them. In all other situations, I consider them essential when marching to war. Scout *everything*. It has nothing to do with wanting to change orders, or to check up and see if all the nobles in the army are moving or not. There are very limited situations in which late-turn orders make sense. It has to do with wanting to see who is in what region, with what troops, in a convenient, comprehensive, and easily disseminated format. Marshal summaries, while helpful in some circumstances, are very lacking in utility, especially when there are people beyond just the marshal involved.