If you don’t swing with a scepter either, what difference does it make then? It opens up hypothetical opportunities for somebody to use ranged attacks in conjunction with the cooldown skills it boosts, as opposed to a melee weapon where you’d have to go into melee to swing it.
Because that is the established mechanism we have for piercing weapons. If they did pure magic damage, their dps would be reduced accordingly.
Then don’t try to use them all.
Because then it would be called Curse of Everything.
If you don’t like them, don’t use them. I’m not sure what to tell you there. They are plenty useful, especially before you reach the end-game, and for players that aren’t power gamers.
Answered by Ceno above, welcome to AI. Pathing is one of the banes of game dev.
There are plenty of players who find it enjoyable. Not everybody is a min-max player.
I suppose it’s bad because you hope for it to do everything, include kill bosses. It’s getting a boost in 1.0.1.0 though.
I don’t know…limited time in my short mortal life? At some point we gotta sleep instead of making more skills/items. 
Why must everything be absolutely equivalent? There’s some Trauma Duration coming in 1.0.1.0.