Pixels are not square.

[Raccoon Sam]

This is an interesting subject (and also guaranteed replies at /vr/)

I play my games exclusively on a CRT

as they can't use CRT tricks on them anymore (apart from if they're emulating a CRT display).

Not yet! CRT tricks are coming back with a vengeance as soon as High-DPI displays are mainstream, because for the first time ever, game and emulator developers have the chance to use non-linear interpolation modes.

My phone is a Samsung Galaxy Note 4 and its display resolution is 2560 x 1440. Its individual pixels are imperceptible, and if I were to emulate Game Boy (160 x 144) on it, instead of filling the 1440 horizontal pixels simply with 9 x 9 clusters of the same color, I could write an intricate algorithm to produce three bands of varying dimness of red, green and blue on a black background, something like you'd see if you stuck your face up to a CRT television, for each pixel.
The concept is still in its infancy and 9 pixels aren't much to work with, but think about ultrawide 4K monitors - their horizontal resolution is 5120 pixels. That would give you 32 pixels of horizontal resolution to work with for a single pixel.

The future looks good imo

See also: what could've been!