Archers on walls = debuff

Do we think this is intentional or a symptom of the manor / castle walls just not being finished yet?

What I find is, if you have an equal number of similar archers fighting from castle walls, they will always lose to the enemy archers on the ground.

I’ve noticed archers on walls get a ~20% debuff on cohesion, therefore no matter what you do, the best you will ever get is roughly 80% effectiveness to begin with.

My expectation would be that archers on a wall shooting down at enemies should get a buff, if anything.