You are actually seeing something the linked article doesn't even mention: fiber length.

Not all cotton is created equally. "Egyptian cotton" was long prized because of the long fiber lengths. Cotton fibers are very smooth and slick, and only stay together in thread because of friction along their length as they lay with neighbor fibers (often twisted, where friction becomes exponential instead of linear). Short-fiber cotton is cheaper and easier to source; ergo, cheaper clothing tends to be made of it. Short fibers are also much more likely to slip within the thread under heat, lubrication, and motion (washing and drying). Obviously, they are also more likely to completely fall out of the thread, creating lint.

This is really only true for cotton and very similar fibers. Linen fibers are generally all multiple inches long, so there's less of a quality issue (they are made from rotting away everything but the longitudinal support fibers of the plant stalks).

Wool varies greatly in surface texture, especially after modern chemical processing, and fiber length isn't an issue because the fibers are also inch-long or better. It shrinks, however, because its friction is SO HIGH that it won't give up (stretch back) once it gets bound up.

Silk fibers super slick, but are several yards/meters long; a single cocoon is made from a single thread. They are much slicker than cotton (and therefore harder to hand-spin), but by the time they are made into thread they have plenty of surface friction maintaining their position in the thread.

Artificial fibers are as long as the production shift lasts, so effectively infinite.

Unfortunately about linen, they often "cottonize" it to use on cotton machines. They just chop that long fiber into short ones, negating much of the benefit. I haven't figured out how to tell the difference.