The idea with these keyboards is that very small movements and amounts of force is needed. The angle of that up key does look a little awkward though. On the Datahand those keys are more or less parallel with the finger itself so they only require a tiny flick.

When I first started typing on the Datahand the most difficult part was getting used to the small movements, I kept hitting the keys by accident. But once you get used to it it's not a problem at all.

Strength training for your fingers.

Might make you good at rock climbing if you're an avid typist.

I thought the same thing! I tried repeatedly straightening-out my fingers without pushing against anything, and it got uncomfortable in less than I half a minute (granted, the movement would be shallower when using this keyboard). I wonder what the risk of RSI is for that range of motion.

It's making my wrist hurt just thinking about it.

Looks tight so maybe it actually requires little movement.

Also, the key switches might require little force; there are no key caps