It's more like that AAA devs always target high-end GPUs.
Nvidia is now selling us less silicone die for way more money, and their sales numbers reflect that.
If we're very lucky, the game will get tested against a wide range of hardware. Sane defaults for GPU feature flags based on detection of hardware capability and the results of that testing will result in a default user experience that doesn't need manual adjustment. If we're lucky.
So tl;dr, they're not targeting the top 1% of hardware. Typically they just screw things up and don't catch it. But higher end hardware will handle poor optimization better and provide a better experience. So it can feel like they're 'targeting' that hardware when really its a poorly optimized port.