Earlier quoted context omitted.
It's not the bandwidth per se, so much it's the continuous attention cost spent on keeping that bandwidth going. Better tactile feedback and more reliable input means I don't have to constantly multitask half a task worth of attention onto making sure the input I think I'm doing went off as intended, which makes it easier to concentrate on the main task, which reduces the build up of fatigue, which reduces the rate a…
By my read y'all need more practice typing, not a fancy expensive ergo keyboard. Other than the occasional hand cramps this lifelong nerd doesn't have any of those problems on this old, mushy MS natural.
So if you are typing a lot, I would recommend getting an ergo before you start having issues.
For reference I could type about a paragraph in one go on a regular keyboard, now I can type an entire page before I start having pains/cramps.