Yes! Fujitsu desktop keyboards have rather pronounced concave keys - not fashionable but very nice to type on. (They have also figured out tactile response with rubber domes.)
Exactly this. Also, the instability means the keyboard is more forgiving of small aim mistakes.
If my finger presses 10% of the wrong key and 90% of the right one, key stability on the corners will mean the keyboard registers both. On the 2015 keyboard it only registers the one I meant. The fact that it wobbles also gives my fingers an extra milisecond to adjust position if it feels it's wrong.
It's also more obvious when I did hit the wrong place and I can automatically reach for the backspace/delete key without even thinking or noticing the wrong key visually on screen.
It's overall a more fluid typing experience.
This is especially useful when I'm typing at night or if my fingers are not moving optimally - like when they're cold or otherwise tight or tired.
