>You see, human hands will become injured over a prolonged period of contortion into the shape needed to operate standard keyboards.

There is no significant contortion needed to operate a standard keyboard. Sadly, the standard keyboard does encourage a regrettable bending of the wrist, but I have found it straightforward to learn not to yield to that encouragement. (Boards such as the Amazon Basics or Apple's keyboards in which the top of every key cap is flat rather than cylindrical help because cylindricality encourages the typist to line the finger up with the axis of the cylinder.)

I have learned to pay attention to the bend of my wrists (the bend in the vertical plane, that is). Once that became a habit, it has taken very little of my mental bandwidth to periodically bring my attention back to my wrists. I do lots of typing and have not had any RSI since about 2004 despite my having a chronic health problem that causes chronic inflammation, which in turn makes me more susceptible to RSI and despite my using membrane keyboards for the last 10 years or so. Specifically, I used 3 of the relatively expensive and fragile Logitech K750 (not recommended unless you are rich), then one cheap K120 (not recommended), then 3 Amazon Basics (recommended).

The Amazon Basics is $13 incl shipping ($10 each if you buy ten) whereas the cheapest configuration (no tilt kit, no wing rests) of your board is $270. Advocates of mechanical keyboards will reply that the mechanical switches will last about 10 times longer than the membrane switches of the Amazon Basics, which I do not dispute, but if you keep your keyboard that long, you've got to clean it very well every year or 2 to keep the population of germs to reasonable levels. My personal experience with mechanical keyboards is that I never find the time to do the thorough cleaning maybe because of a nagging feeling in the back of my mind that even a thorough cleaning won't reduce the germ levels to anything nearly as low as the levels of a new keyboard.

And by the time the mechanical board is 10 times older than the age at which the keys of a membrane board start to become mushy, you've probably had to do 1 or 2 repairs of electrical problems on the mechanical board. Case in point: for a few (not more than 4) years in the 1990s I used a Kinesis Advantage, which consists of about 10 PC boards internally. When one of these 10 boards failed somehow (rendering the board useless) the manufacturer told me it could be replaced by them for 50 bucks, back when a new board cost about 270. (I decided not to pay that because I had learned by then that I didn't like typing on that design of keyboard.)

In summary, being able to afford to replace my keyboard every year or 2 saves me from tedious cleaning an repairing tasks, which I find worth the cost of my having slightly less attention to give to the cognitive content of whatever programming task or writing task I am engaged in when I am typing because I reserve a very small fraction of my attention to how bent my wrists are.

Actually, the case for cheap keyboard is even strong than that. Here goes.

When a typist switches from a standard keyboard to an ergonomic keyboard, the sheer unfamiliarity of the new keyboard basically forces the typists to pay much closer attention to the physical act of typing than he needed to pay while using the familiar keyboard. I believe it is this increase in paying of attention that is the cause of most of the reports of ameliorations of RSI after switching to an ergo keyboard, and that if the RSI sufferer had been familiar with an ergo board, then switching to a standard board would produce ameliorations at roughly the same rate and to the same degree!

In particular, regardless of what kind of keyboard we are using, we should pay enough attention to the physical act of typing to ensure than (1) our wrists are in roughly neutral position, (2) at the moment the tip of our finger hits a key cap during a keystroke, the tip is moving faster than it would have been able to move if the tip were resting on the key cap at the start of the keystroke (3) at the moment of contact, the finger tip is moving roughly in the same direction that the key will travel.

I am told that the reason (2) is important / desirable is that the human brain is better at striking accurately than it is at pushing accurately. I am also told that there is something about the "backswing", that is, the moving of the finger tip away from its target in preparation for a movement towards the target, that improves accuracy and consequently reduces the strains that lead to RSI.

If they made a cheap keyboard that did not encourage the typist to bend his wrists and was otherwise as good as the Amazon Basics, I would switch to it. But no matter what board I use, to avoid RSI I have learned I needed to pay slight attention to ensure (2) and (3) above. Given that, it is very little additional trouble for me to ensure (1).