Armor Penetration Boots?

If there is Magic Penetration boots, why dont we have Armor Penetration then? {{item:3020}} has 18 Magic Penetration, that almost counters the 25 magic resist that you get from {{item:3111}} (of course if also gives tenaccity, but it also costs more) For a non-lethality ADC {{item:3047}} is hard to counter. And, for example an Ezreal cant really afford going {{item:3006}} because its not that effective (also for Jhin). I think a 1100 Gold cost Armor Penetration boot could be a good second choice for an ADC, if Berserker's is not a good choice.
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