Yeah, the article was painting with a bit too of a broad stroke IMO, though they did briefly acknowledge "special exceptions" such as satellite or medical imagery. It's very application-dependent.
That said, in my experience beginners do often overestimate how much image resolution is needed for a given task for some reason. I often find myself asking to retry their experiments with a lower resolution. There's a surprising amount of information in 128x128 or even smaller images.
I have a vivid memory of playing Rise of the Triad[1] against my buddy over serial cable. As most PC games from back then, it used mode 13h[2], so 320x200 resolution with a 256 color palette.
I have the distinct memory of firing a rocket at him from far away because I thought that one pixel had the wrong color, and killing him to his great frustration. Good times.
You can play the shareware portion of the game here[3] to get an idea.
That said, in my experience beginners do often overestimate how much image resolution is needed for a given task for some reason. I often find myself asking to retry their experiments with a lower resolution. There's a surprising amount of information in 128x128 or even smaller images.