The amount of real estate you get with 2560x1440 is fantastic, and you can actually game on it at native resolution on older gen graphics. The pixel density of 27" @ 1440p is the epitome of goldilocks. Every single pixel is just the right amount of useful.
24” @ 4K would be perfect but is hard to come by.
Being able to see my screen's pixels annoys me a lot more than moving my mouse at 60 Hz.
Camera lenses introduce blur through the use of the shudder, which acts as a form of "interpolation" and smooths out the image. Displays do no such thing; image strobing is extremely noticeable at different framerates. The difference in Destiny 2 between 60FPS and 100FPS is quite literally shocking to the point I can't go back.
[1] it's not as bad as you think
The first one people say you shouldn't turn on to respect the artist's vision, but I sure hope they don't mean it, because that'd mean they're respecting Harvey Weinstein. Clearly leaving it on is the moral option.