@RX8 - My copy of the rulebook disagrees with you. In my copy of the rulebook, pg 117, top right corner...
"Of course, in an Unbound army, these models are not bound by any detachment restrictions and do not receive Command Benefits."
My copy of the rulebook also describes on pg 117, under "Battle-forged Armies",
"A player using the Battle-forged method must organize all the units they want to use into Detachments." meaning that if you aren't Battle-forged - by having every unit be part of a detachment - then you are Unbound, so you don't get Command Benefits.
But that's just my copy, of course. You may have a different version, with different rules. If you could please quote me the page from your rulebook that says differently, I'd be interested to read it.