I’ve done a fair amount of observation of “proper” typing technique, as well as paying attention to my own motions. Once I understood what I was looking for, it became clear to me that, for people who don’t rest their wrists, the right arm moves in a different way than the left on a standard keyboard. If you can, just look at the elbows. When I type on a standard keyboard, my left elbow is nearly stationary except when typing T on a QWERTY keyboard, but my right elbow is constantly moving forward and backward. This is the thing I like least about the Model01; it forces me to be constantly moving both forearms in order to transition between rows. My second least favourite thing is the extent to which the columns are staggered, which is more extreme than the difference in length of my fingers in their natural relaxed positions. I’m pretty sure that’s also a difference between stationary-wrist typing and floating-wrist typing.
I have never seen an ergonomic keyboard that appears to be made for floating-wrist typing. That’s not too surprising, though, because it’s probably far more likely for typists to get RSI problems if they keep their wrists stationary, so floating-wrist typists have much less desire for ergonomic keyboards on average. Also, as the percentage of people who type frequently has gone sharply up along with personal computer usage, the percentage of typists who rest their wrists has also increased dramatically. Back when typing was done on mechanical typewriters (i.e. non-electronic, unlike the term “mechanical” as applied to keyswitches), it was not possible to rest one’s wrists, because the force required was beyond what fingers could produce on their own – similar to playing a piano. So, while it may be much healthier for people to type without resting their wrists, the fact is that most people do, and will continue to do so. While I’d be more excited to see someone make a keyboard with a physical layout like this one, I don’t hold out much hope that it will ever be done.
All that aside, there’s one problem I would have with the KLE layout you shared – my right thumb, which would normally be used for the spacebar, would naturally rest between two keys on the bottom row, not on the wide “spacebar” key below
M. I’d have to curl my thumb in to use it, and I’d always be tapping that corner of the key while typing, which I would expect to get uncomfortable pretty quickly. I think a pair of 2U keys instead of the 1U keys in the center of the bottom row would be better, and the rest of the bottom row could be filled with just 1U keys. I’d also have a strong preference for a symmetrical keyboard, either with four fewer keys on the right side or four more on the left.