Oh please. I have been using 1920×1080 displays for a while and there's nothing wrong with them. To claim that 4k is not good enough and you absolutely need 5k, that's just ludicrous.
I agree with the conclusion that a Hackintosh misses the entire point of a Macintosh, but for different reasons.
I'm not an Apple fanboy. I have owned 3 MacBooks in the past, but lately I have switched over to Lenovo laptops running various flavors of Linux.
That being said, Apple's hardware is undeniably well engineered and aesthetically pleasing, to a degree IMHO unrivaled in the industry.
It features a deep integration of hardware and software, meaning that they are developed by the "team next door," that allows Macs to excel in areas considered "difficult" in other OSs, such as battery usage and fast and reliable standby/wakeup. This level of integration between hardware and software is again unrivaled, except in the smartphone and tablet industry, which closely followed Apple's lead with the iPhone and iPad.
Finally, Apple's software has traditionally been very user-friendly, intuitive and bug-free (IMHO this was true 10 years ago, less so now.)
This is what people are paying for when they buy a Macintosh and it's something a Hackintosh misses completely (except for the last point, I guess.) Not the 5k display.