you can still use them as mainhand, and they do shoot missiles if you right click the mob. the damage is near nonexistent but its a thing.
It’s just that blizzard is an indie game company and they can’t manage too many things that have to keep in mind in class balancing.
I mean how do you make wands useful to casters when they don’t even use mana to begin with? Arcane mages could use them but blizzard doesn’t remember they exist.