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But it's not anything modern. Typewriters have basically always had the row behind be higher than the row in front. You're supposed to float your wrist over the keyboard, or just get a wrist wrest if you're lazy.
https://thebenningtonnapa.com/cdn/shop/products/vintage-woodstock-typewriter-the-bennington-napa-valley_1440x.jpg?v=1629257891
https://i.rtings.com/assets/products/iCHTgoaB/ibm-model-m/ergonomics-large.jpg?format=auto
That's because they sit at their desks like goblins.
Typewriters were not designed for ergonomics at all. They were made to make mechanical levers attached to the keys functional.
The up-angled keys are basically just a relic of mechanical design that people got used to. Like the QWERTY layout, which is also designed for mechanical function of a bunch of tiny levers swinging at a piece of paper, it's actually designed to slow down typing speed and is also terrible for ergonomics.
https://www.therevisionist.org/ergonomics/best-keyboard-tilt-for-reducing-wrist-pain-to-zero/
Negative tilt is the actual ergonomic position.
Much like QWERTY, keyboards are designed with positive tilt for no reason other than "it's always been that way" and "people got used to it"
This is a myth
In both the positive and nuetral tilt position they have their wrists on the table which nobody says is ergonomic. But in the negative position they actually have their wrists off the table.
If you float your wrists off the table (or just have a wrist rest) then you'll be at an actual ergonomic position. And the upward angle keeps the further back keys just a little bit closer to your fingers so you don't have to stretch for them.
I don't think that appealing typewriters as an authority on ergonomics is really a great move.