> It is like saying a touchscreen is thousands of switches just because it has that many sensor points.

Huh? This is such a bad counter analogy. Allow me to expand and prove my point.

First, let's clarify what type of an input a keyboard switch is? It is Single Pole Single Throw or SPST. It is also momentary (meaning you have to keep the key pressed to close the circuit). 104 keys on a keyboard, each key is a momentary SPST switch representing the ASCII character set (let's simplify).

On a touch screen, if it had 104 boxes, each representing a monentary SPST, then it is identical as far as the interaction is concerned. The finger went down, pressed inside a box or a key, and a character appeared on the screen. They are identical (in logical sense). The circuit element is the same, see the symbol for SPST here [1].

You're comparing 104 individual options for character input to a pixel on the touchscreen? Why? I don't follow and what point are you trying to make? The action is taken as a press of a finger in a specific area, not a single pixel.

[1] https://en.wikipedia.org/wiki/Switch#Contact_terminology

The point is that it does not matter that keyboards have 50, 100 or 200 keys dedicated to characters for text entry. That is something that came out of biology and the average human capacity to coordinate their fingers, their length, etc.; as well as the limits of technology at the time.

The comparison with cockpits is meaningless because keyboards are not "104 switches", but a single method to deliver input text (for the most part). The same way touchscreens are a method to deliver input, not an interface on itself.

No one is talking about the method of input or classification of input device, the response I provided to the parent comment if you scan back up is about switches. To which I said a keyboard has 104 switches. That's all.

I think you are right and if they could use a simulator to practice it would be very easy to learn all the buttons by heart. Certain controls will just easily translate across any aircraft and the others you can just train on like any other vehicle slowly learning until you master it. I don't think 200 controls would take much mental capacity with practice. In many aspects of life we are taking in countless factors in what we do and make decisions instantaneously based on those factors.

Absolutely--this is a standard practice in a lot of flight training. Some places use "cockpit procedure trainers," which are basically plywood mockups of aircraft cockpits, featuring all the switches in the right places but no simulation capabilities. It only takes a few hours of practice to learn to locate and identify an arbitrary switch or instrument in the cockpit with your eyes closed. CPTs are fantastic for learning all kinds of procedures and building good habit patterns without the expense of a full-blown sim or actual flight.