Looking at this Keybee layout it seems not very usable. The biggest change when typing on touchscreen is using your two thumbs instead of ten fingers, and IMO for the flow is more important that letters alternate the left (L) and right (R) thumb, instead of minimizing distance. This way one finger can move while the other is pressing. I'll take their "Hello there is a starman waiting in the sky" as an example. On a qwerty layout the letters you type with L and R are evenly distributed and the longest run with the same thumb is 3: "There" is LRLLL. On Keybee however, the same sentence is typed almost entirely with the right thumb (dominant hand, so I would probably use it to type the middle letters W, H, A and space). Now the longest run is 16! I guess this would be a bit more balanced is I figured out which of the middle keys to take with my left thumb, but it doesnt seem worth it especially with the enormous keyboard. As part of the younger generation I can type blind and relatively fast and error free on touchscreen. If you really need to type a long email just switch to a regular keyboard, having ten fingers typing is much faster than any layout using only your thumbs will achieve.