Hm...quite interesting, but are you sure this is a panzer group 3 order as given by Reinhardt? I rather think itīs a normal corps level order, as given by the commander of that time (Walter Model) to his corps units. Itīs also indicated in the first line beeing a corps level order:
"XXXXI (Motorized) Corps Order #31/41"
Nah, I mixed that up. There are also the orders for the whole PzGruppe in the Appendixes.
So at corps level, giving these sort of detailed orders is quite normal, as also independent army units (beeing temporary corps assets) like in number 6.) Artillery, are organized with the divisions.
That's my point regarding the level of intervention which is "normal" or "reasonable" at the scale and size of some of the scenarios in BFTB and HTTR. As I point out in my post, these Corps-level orders obviously will be generating missions at the lower level, which I'm pretty sure had similar features and content (with the same remarks about routes, force composition and artillery assets distribution, but at a smaller scale). And so recursively down the chain of command, all the way down Bn's.
Besides that, the player in Command Ops has to wear many hats, starting from the Corps commander and ending (sometimes, but not too often) to the Bn Commander. The frequency the player gets one particular hat "on", and issues the missions wearing that hat entitles her to, is situation dependent.
For many cases, the friendly AI can further develop players' plans without tweaking. In other cases, it's necessary to "constraint" friendly AI subordinates planning process by either issuing "task modifiers" (such as attitude wrt to losses, asking to bypass enemy positions, etc.) or the player needs to get on the hat of that subordinate and issue the orders herself.
What I find particularly interesting about that corps orders, is that Model ordered the 129th infantry to form an advance detachment, indicating that this division already operated in that way before (itīs the only foot unit in that mot. corps). Those advance detachments were usually formed from the only mobile assets of a normal infantry division, likely parts of the reccon Bn, panzerjager, an Arty Bty and some more infantry made mobile, by taking trucks from the supply trains.
Other messing on small scale obviously is meant to rule security for the bridgehead, that the mobile forces use to resume offensive movements. Supply situation also appears to be less than optimal and 6th Panzer likely is not fully battle worthy anymore.
However, looking forward for making similar considerations, once CO goes east front.