the natural angle of the wrist is actually INVERSE, but it's not very easy to create inverse keyboards.. or use one, because it tends to make one want to lift their shoulders.. hard to learn..
Do you have links to any diagrams explaining this? I had read quite a few complaints about Ergodox-style keyboards not accomplishing their ergonomic duties, even with tenting. Is it a matter of desk-wrist-keyboard height? Or just not enough tenting?
Ergodox requires alot more tenting than users often attempt..
And you are correct that it also greatly depends on typing surface height..
If the surface is higher, as in your elbows are closer to your shoulders, the tenting needs to be reduced because as the elbow rotates outwards, and is raised, the forearm automatically rotates Inwards.
If the elbows are lowered, with the upper arm completely rested at the side of your body, then the angle of the wrist resting on the table (@ that particular height) is roughly 70*.. but the Neutral angle is inverted, roughly 140 degrees from the center
On my standing desk, My ergodox is tented 55* using 2x 100mm bolts.
So that's ~180mm off the table in the middle. Most people wouldn't even consider going this far.
There's a table size mouse mat on the table, so the ergodox stays in place because the side edges dig lightly into the mat against lateral movement..
You don't need a diagram to determine the angle you want at your typing height... Move your elbow to the height and angle you type at, then Just squeeze your forearm, feel where the bones are.. Notice that the Radius-Bone moves Over and crosses the Ulna-Bone as you rotate your wrist..
When the two bones are parallel, That is the neutral position.. You want to move towards this position as much as possible,
The limitation is the fact that you can't really cross 55* without modifying both x and y axis tenting..
55* is the maximum with only x axis modification..
if you want more than 55*, you'd need to rotate y axis towards you as well.
And if you want to go all the way to 140 neutral position.. You'd need a weighted keyboard that's built inverted.. ONTOP of relearning alot of muscle control to dampen shoulder and trap muscles which would naturally want to raise your arms