Someday soon (if it hasn't already happened) a book will be published that was written and edited entirely on a phone/tablet with a touch keyboard.
I can't even imagine writing long form on a touch keyboard. But with a lot of people eschewing laptops/desktops for their mobile devices, it's really just a matter of time.
Severe ME/CFS: A Guide to Living was written entirely on phone by Emily Collenridge, someone who suffered from very severe ME/CFS (one of the illnesses with lowest Quality of Life) and could only use her phone for brief moments. Over years, writing a tiny bit each moment she was able to use her phone, she wrote her book which was published.
This book is really invaluable to the patient community as it is one of the only ones we have, since most people with that level of illness aren’t able to communicate at all.
Sadly she died in hospital a couple years later, in her early 30s.
My entire comment history here, and the last 10 years or so on Reddit have been exclusively from a phone. Weeks go by that I don’t touch an actual Mac or PC anymore.
Most of the short stories or ideas I have written down in the last 10 or so years have been on my phone; nothing published, though. I can type faster with my thumbs now than I can using a regular keyboard since I am so out of practice using a keyboard to type. Used to average 120WPM.