I play at 4K on a 55" screen and recognize the shortcomings of small pixel size. The problem is, I refuse to sacrifice the picture quality for a larger initial contact size. I used to play on a high resolution Dell 30" monitor (2560 x 1600) which has a most excellent picture, and a pixel size even smaller than the 4K TV, so when I went to the TV, contacts became easier to pick up. It has to be a matter of personal preference as to which level of detail you will find best.
With all that said, I have a method for optimizing contact recognition, no matter what display you have. This involves the seating distance from the screen. Most of us seniors have "Bit the bullet" and paid for some overpriced reading glasses (with the old-age prescription) for muddling through the morning paper. Some of us have taken this a step further by ordering a diopter adjusted pair of glasses that permit sitting as close as possible to the screen to allow clearly seeing a single pixel. With the right glasses, we can then see the "Grid" that makes up the screen, and therefore clearly see a single pixel sized object. (The smallest possible contact). For example, the distance from screen to eyeball for me is 22 inches...
The constraint on how close you can get to the display is simply physical. How close can the chair move forward and how far can you pull the display screen towards your eyes. Finally, you have to allow for your TrackIR camera mount distance which can prevent really close up distances. Anyway, once you get the closest distance figured out, visit the optometrist with a pair of old frames from the seventies (Really BIG frames) and have him put your prescription with the new distance in those frames. The difference is a pleasant surprise!
EDIT: My first "Close-up" glasses, based on measured distance, were not right. So on the follow-up visit, he had me sit in front of his office computer at my desired distance. He then held up diopter lenses until I saw what I was looking for. Second try glasses are perfect!
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