Here we have The Squeeze scraping the goop off yucca leaves, then separating the fibers within.  She is using a bit of sea shell - Atlantic cockle, from Ocracoke Island, NC - for her scraper.

The leaves/spikes have been boiled to make the scraping easier. Or even doable.

Alternatively, the spikes can be pounded with a stone and then chewed. I was kind of hoping to see that, but nope, she took the easy route.

The fibers can then be used for making cords or yarns, or for basket making and other such bits of creativity.

There are some separated fibers in the tray in the background.