I guess I'm just a control freak.
It seems like from your experience that liaison units are not very effective on the attack. But what about on the defense? Less movement is involved on the defense, especially early in the game...
Now, if I were a CO or artillery officer and liaison units are permitted, I would have my subordinate officers momentarily transfer command of some of their units with LOS to critical targets to me, so I could use the precise locations of the enemy units for targeting artillery and air strikes. Of course, I understand that imperfect information and reporting is what makes these CPX/MTM games fun. But let's face it: a picture is worth a thousand words and nobody wants to lose.
This brings me to my other point. Should screenshots be exchanged among team members? If I were CO and have a UAV to fly around, I would want to take a screenshot of the enemy's formations that are seen from the UAV and pass it along to the subordinate officer(s) who will likely make contact with the spotted units. A lot of players have broadband, so exchanging screenshots could be done in under a minute or so. But would such practice essentially degenerate the CPX into a 2 player game with servants who do nothing but enter orders?
What do you think?