Economically mass producing microchips is only possible because they are 100s of square millimeters in size and very valuable per square mm. Any bigger than that and error rates in the fab process start to destroy the yield.

These fibers are used in much bigger applications like body armor or mechanical composite parts where the surface area is on the order of square meters, not millimeters.

Older processes are cheaper, but 5nm node costs something like $25,000 per square foot (with around 0.1 defects per square cm, which may result in waste) and doesn't do pieces larger than about 1 foot. That's pretty bad as far as textiles go.