1. Using substandard digitzer tech (something as performant and economical as Wacom EMR is needed). One cannot compromise here. I get that this might also be a licensing issue.
2. Making the device too big. 10.3 inch or smaller is better; the possibility of using the device in a train's or on a plane's fold-away tray table, just to be stashed away in a cross-body or small messenger bag after use, is still a killer feature. More real estate (by way of screens, ultraportable projectors, et cetera) can always be thrown into the mix later.
3. Choosing a wrong, or to be more precise obsolete, form factor. It needed to be a detachable for more modularity and flexibility. So, it's just another, admittedly very maintainable, premium-priced classic convertible. Its attached keyboard is a design-compromising dead weight and/or wasted space whenever not in use, very much like (the unused) maneuvering jets on older VTOL aircraft while in conventional flight.
4. The display is not of primary importance here, but there's no need to make it that bad. Top-notch, wide-color, flicker-free IPS displays do exist.
5. Sturdy but lightweight metal, not plastic.
And so the search for a well-designed, modular SFF general computing device continues. They nailed the colors tho, and hopefully continue to set an example in Linux support. I wish them plenty sales, I'm sure the machine will find its fans.