Been working on a handheld cyberdeck with a good thumb keyboard. I'm masochistic enough to write entire projects on my smartphone with vim running inside termux, so I think anything that improves on this will certainly be used.

Measured my thumb's swiping arc and designed a split keyboard specifically for my hands. Managed to get every symbol in there with no layers. Now I just need to save up some money and order protypes so I can get a feel for the switches. Can't move forward until I've perfected the keyboard.