It's interesting to see all these highly unusual input devices, but as someone who can already type all day at 150wpm on a regular QWERTY board, I don't quite understand how much better something like this can make you type.
There was a poll yesterday on Reddit about ergonomic keyboards, about half of the respondents had RSI as answer, and only ~5% responded typing speed: https://www.reddit.com/poll/13mnq7q
Speed is only one aspect, comfort is the main benefit for me. The biggest change in comfort I found going from row stagger to ortholinear, then a small bump again going column stagger and low profile