Pixels are not square.

[CyberneticCupcake]

[T]hey're all valid types of art with no real "correct" method - they only work on whatever media the artist was limited to, and now that we are virtually limited to LCD/LED screens with very definite pixel grid (not considering CRT emulation filters), square pixels are simply the logical step on how we deal with pixelart nowadays.

All in all, it's a very interesting talk and pixelart has evolved quite a lot from being physical mosaic to completely digital pieces of art, but to be this adamant about "pixelart not being used as it was meant to be" is kinda like saying "mp3 shouldn't exist because real instruments exist"

Exactly. While I'd like to see more experiments in "non-square" pixels, this is more for artistic consideration than for any sense of "superiority".