Dude, what is your deal? He's running a GTX 1070, so a 2K monitor makes more sense.
I love bigger displays, but in a desktop environment, even I don't see the point in going beyond the 35" Ultrawides out there. It's not about the ideal resolution vs. viewing distance chart, in this case, either, it's simply about the physical size of the monitor at a certain distance; where your eyes physically can not take in an acceptable proportion of the screen, and this varies from gamer to gamer, but 27" isn't much smaller than the Ultrawides, and it's also the most commonly used monitor size by professional PC gamers, so clearly it's well-tuned to the typical 2'-2.5' viewing distance in a PC desktop environment for competitive play.
This guy is a PC master racer, and you're still finding a way to see only the differences between your preferences. Check your toxicity levels.