The problem with Sterak's is that it scales with health (it gives a shield for a % of your max HP), and it only multiplies BASE attack damage. That means it doesn't matter if you have +180 AD or +3 AD, as it only multiplies the basic stats your character has innately. This way it's only aimed at offtanks/tanks and not at AD assassins or ADCs.
Also, I think this belongs to the Q&A section. I don't think it's a big mistake, but next time you should make your "small" questions there.
Also, I think this belongs to the Q&A section. I don't think it's a big mistake, but next time you should make your "small" questions there.

Ekki explained it well. ADCs have statistically low base AD and at most only get 30-60 AD by purchasing it. For example, I have used it on
Ezreal, who has a base AD of 101 at level 18.
Draven has a base AD of 110, granting him 27.5-55 AD. Meanwhile a champion like
Darius (the items intended brand of user) with a base AD of 141 gets 35.25-70.5 AD off it. These champions also boast much higher base health and have room to build more health to fuel the shield.
In my example of
Ezreal, I had 2100-ish health after purchasing the item with a full build of
Ionian Boots of Lucidity,
Muramana,
Trinity Force,
Bloodthirster
Last Whisper and
Sterak's Gage. This nets you a shield worth roughly 630 health, which seems like a lot, until you realize that you have no defensive stats, and are bound to die anyway if you get caught.



In my example of







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