@Riot Why is there no Armor version of Wit's End?

I know Wit's end is sort of a niche pick for certain champions and needs to be reworked all together but I was wondering why there isn't an item that includes (armor + attack speed + on hit). It would make sense against certain comps that are heavily running AD champions, the on hit is nice but if they don't have any AP on there team it's not worth the build. Any thoughts on why this isn't a thing or why it can't be?
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