After years of shoulder, neck and back pain I discovered that the root cause was the standard keyboard design. It causes rounded shoulders. Perhaps my shoulders are just too wide. This pinched all sorts of muscles, tendons and nerves. Doctors and physical therapists just failed to identify the issue. Weight lifting didn't help all that much, even with a strong back I had to scrunch and round the shoulders to type.
I finally picked up a second keyboard, and used one for each hand. It was surprisingly easy to convert to. Just added some larger rubber nub things on home row.
It's been life changing. Years of pain was gone in days. No special design necessary.
Each keyboard is arranged at an outward angle, distanced so my shoulders are in a natural position.
I can't recommend this enough.
On Mac it required a system preference tweak (Karibiner app) so each keyboard can share shortcut keys.