Demoing an Arm-Strappable Keyboard
old.reddit.com
old.reddit.com
I use a similarity small keyboard layout and the one thing that's stood out as "next level" for it's design is one-handed use. I.e., be able to access all the letters from a single half of the split-keyboard. QMK makes this easy with it's swap-hands feature, although I haven't implemented it for my own layout yet. If I had a keyboard like the one demoed, I'd want to be sure to have that functionality available.
Being able to hold and operate a touch screen phone with one hand while sending keypresses over Bluetooth to it with the other without having to switch hands or hunt-n-peck would be truly awesome.
Also, Slava Ukraini!