I get where your coming from here, but I believe enchantments are not needed for crossbows, as you can just spam out 9 arrows incredibly fast with a hot-bar of loaded crossbows, which is capable of dealing massive damage to a target in the space of seconds, even a second if you're quick. Also, since crossbows can be loaded and then stored in your inventory is also incredibly useful. In all situations, I would prefer a crossbow to a normal bow because the crossbow I feel is better tailored to my fighting style.
Enchantments are a little lacking tho