Yes it is very annoying that the units decide to move in line formation when re-orging on the objective, especially when enemy units are still near.
Even more annoying is the fact that they try to go into a dispersed all round defence formation on that objective, once they have reached the assigned attack marker.
In my opinion they should stay in the formation they where ordered to attack in, and defend in situ, once they have achieved the objective.
As soon as the hub unit reaches its assigned assault marker, the whole formation then tries to go into all round defence cantered on the point you set as your attack marker.
They do this in road column formation that has the same problems as I have pointed out in this thread,
tm.asp?m=3491203
Where they pick up LOS of the enemy units that have just been pushed of the objective. Sometimes they will even wander of a long way to find an alternate route to get into this dispersed all round defence formation, more often than not, wandering blindly into enemy location.
Another problem with it is that they often stack up on top of each other making a lovely target for massed enemy artillery, during this re-org phase.
Then of course is the issue where the HQ unit often goes via a different route that the line units have just cleared, also in road column.
It would be much better if they would just defend, and re-org in situ, and await further orders.