I would have to agree. The spacing on the keys seam to close as well, but maybe that is just my perception. Don't get me wrong, the Planck and Preonic are great concepts and they have their place, but I think long term use will cause shoulder pains at least for me. This is probably one of those great trade offs, portability/compactness vs ergonomics.
Now the "Lets Split" may be a how you solve this issue.