A couple of thoughts...

Alternatives to typing

I'm really intrigued by the one-hand typing device shown at the 8 min mark in the video. I'm impressed the inventor of the Microwriter wrote an entire book in the one-hand typing device. The narrator say it took him about 30 minutes to achieve competence in using the device.

Word processors (WP)

By the early 1990s (maybe earlier), GUI word processors were widespread, but the word processor does not seem to have changed much since then. The past 15+ years has been about implementing word processors in the browser (with fewer feaures than the more powerful 30+ older desktop word processors). Progress? Or re-inventing the WP again in the browser?