I reckon the experience bonus for missile units should benefit their Missile Attack attribute; e.g. for every three chevrons you get +1 Missile Attack value. As it is you've got a small boost to melee attack and the usual boost to morale.
The melee boost is usually neither here nor there as you don't deploy archers to fight other infantry hand to hand. The exceptions are dual-role archer/melee units such as Ottoman Infantry or Norse Archers who are designed for a bit of hand-to-hand action.
The morale boost is good as most archers have a morale of 3 - 2 below the average - so any gain helps in the unit not giving up immediately on contact with enemy cavalry until help can arrive from other infantry.
But as archers are there as "a woman's strategy, to throw things at us" surely it is their throwing ability that should get the experience boost.
p.s. I'm still pretty sceptical about the idea that accuracy is improved from the fact that accuracy is coded to be tied in with projectile-type.
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