If you’ve spent any time with graphic designers, you’ll know that they love spending your money on imperceptible tweaks to your image files. “It must be pixel-perfect!” they cry. When you query why they’ve generated the same icon in multiple sizes, each with subtle variations, they cryptically mention how everything must align with “the grid.“
This is hokum.

— The Myth of the Pixel Perfect Grid by Terence Eden

I have a couple of design friends that will keep on doing things pixel-perfect because of their OCD.