If 4K wasn't better, then they won't add new effects to take advantage of it because there would being advantage.
What the fuck? What the GP was saying (and is entirely correct in doing so) is that the Mark I Human Eyeball has not meaningfully changed between Philo Farnsworth's first televisions and today's 1080p monstrosities. Besides human physiology our houses haven't gotten a whole lot bigger either.
Going to 4K resolution isn't going to do much for anyone because we're not going to get any additional visual information from the increased resolution. On a 55" 1080p TV every pixel is about half a millimeter. At any reasonable viewing distance you can't distinguish that the screen is even composed of pixels. At 4K a pixel would be roughly half that size. If you can't distinguish pixels today increasing the screen resolution isn't going to give the human eye any more visual information.
Before you mention computer monitors, consider the use case for them. You're almost always within three feet of a computer monitor when using it, often much closer. The difference between 1920x1080 and 2560x1440 is noticeable. Even on something like a cell phone the higher DPI screen is worthwhile because it's held so close that the increased pixel density is viewable by the human eye. A television which is viewed at much longer distances doesn't need the same sort of pixel density until it gets bigger than will fit in most homes.
4K cinema projectors make sense because the screen you're viewing is far larger than that of a TV even accounting for viewing distance. 4K in the home is a pointless endeavor that would only exist to get people to throw away perfectly good 1080p televisions because a stupid marketing campaign told them that they weren't good enough.
The move from tiny highly curved CRTs to larger flatter ones was a visual improvement. Moving from those to the totally flat Trinitron style CRTs was an improvement. 480i to HD was an improvement. Now we're really at the limit of what the human eye in the average person's house can actually use effectively. There's no magic special effects tricks that would make 4K displays in the home all that better to use.