Iron Ideas: Attack Speed on Mages

Why don't more mages (excluding Azir) consider taking something like Nashor's? {{item:3115}} Not as part of their core build or anything, but mages with high AP can actually shred towers pretty hard with autos. In the example, Nashor's Tooth gives them the AS to do it better while also having stats that they care about anyway (decent chunk of AP, CDR). Additionally, mages should be weaving in autos between spells anyway in fights, so it's not like the on-hit damage is wasted. In short, obviously it's not amazing in all situations, but why don't mages looking to take towers faster build attack speed?
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