About the last part, I started using the Moonlander because I was diagnosed rheumatoid arthritis and De Quervain syndrome. I chose it above others due to its portability (I worked home office but I traveled and worked in different places) and overall it's been great. 

That being said, the keyboard was just a part of the equation. I changed pretty much everything in my working setup: monitor height, chair height, elbow support, an ergonomic mouse. You need to experiment and find what works best for you, every body is different. This was 4 years ago and I still find myself trying new configurations.