Why isn't there an armor/AD item?

I know Atma's was a tanky item that used to semi fill this role, but why isn't there an item with raw AD and armor on it? I've only been on League a year, and never play ranked, so forgive me if Riot has answered this and I've missed it. There are items with AD and MR, one having 80 AD. There are AP items with armor and MR, like Zhonya's, Abyssal Scepter, Athene's, and that's all I can think of off the top of my hand without looking them up. But there isn't an AD and armor item, which would help if you fell behind in lane as an ADC to have something like Scimitar to help you get some damage and defense and back into the game. Even Atma's was geared towards tanks/bruisers. But if a Yi/Talon/Zed gets fed, what can you build besides GA, which will only revive to have them kill you again? It would be nice to have a little protection mid game against fed AD champs as a squishy carry. It wouldn't be abused, as most would prefer raw damage over defense anyways. And bruisers may even benefit if it were made right. So I've just always wondered why such an item isn't made. Any help or thoughts to answer my question would be appreciated. I'd love to know if any of you have an answer. Thank you.

Edit: So the reasons I'm given so far are:

1. It would be OP from lifesteal
2. It could drastically change the meta by making every jungle go AP.
3. Make top boring ( even though AD-AP match ups can build defenses to one another)
4. It's a noob trap
5. Build Sunfire Cape, Thornmail, or Iceborn Gauntlets.

Maybe lightbringer was OP because of the other stats it gave, not the AD + armor combo? That's quite a ball of stats for

Edit 2: Maybe an item with a passive that reads like this: If a champion takes >50% of health in damage from another champion in (2 or 3) seconds or less, the remaining damage from that single champion is reduced by X% for 5 seconds.
Counterplay, right? Or no? ^^^ Would this help mitigate those champion that start snowballing (doesn't matter who, Zed, Yi, Riven, Kat, etc.) and kill everyone they focus in like 2 seconds or with a single ult? ** It would add some counterplay, in lieu of a slot that could be used for a different item. So some give or take, and stops one person from wrecking a team early in the game.** Just to clarify, I played yesterday with 78% physical damage reduction with 4K health and still died in about 5-6 seconds by Yi. It's not just carries, it is tanks too getting one shot by these 'assassins'.