If a noble isn't going to ever follow the orders of the Marshal or have any interaction with that army, then he shouldn't be part of that army.
Couldn't agree more. As a Marshal, I simply hate to have Lords/Priests in my army, knowing they will never follow orders. Mainly Lord Pyrix in Thalmarkin
(not wanting to attack the player here)
Also, if your Lord assigns you to an army, you are expected to follow it's commands. If you can't comply, your Lord should force you to, or remove you from the army altogether.
The problem is probably that some realms mainly seem alive through their armies, and you miss out on a lot of correspondence not being part of them
