First step is to logically organize/simplify the system no matter if it is text-based or graphics-based...not surprisingly, everyone seems to agree on this. 🙂
With quality touchscreen hardware, even if the menus remained as they are (just text), things would be greatly simplified.
Here is an example on my Fuji X-H1, which has a hybrid touch system. There is a touch screen, but it's not nearly as precise or refined as a smartphone touchscreen. And it's not full-featured; the menu system can't be operated by touch.
However, the touchscreen DOES work to enter copyright info, for example.
Here is a simple example comparing the various methods of entering copyright data:
• Button presses only
• Button presses plus touchscreen
• Touchscreen only (hypothetical; not currently possible.)
If the touchscreen is not used at all, just the directional buttons, entering copyright data from the top menu requires:
• 22 button presses to reach the ENTER COPYRIGHT INFO screen.
• 49 more button presses to type in this text: HELLO THERE -- actual copyright info would be more detailed than this example, of course. 🙂 (Maybe someone else is more efficient than I am and could save a couple of button presses with the text entry.)
Total: 71 button presses.
Alternatively, using the touchscreen to enter the text data:
• It still takes 22 button presses to reach the ENTER COPYRIGHT INFO screen.
• But it only takes 11 keystrokes to enter the HELLO THERE text.
Total: 33 presses or keystrokes.
If the touchscreen were fully implemented on this camera, so it worked with the menu system, it would be much, much faster:
• Press Menu button
• Touch Wrench icon
• Touch SAVE DATA SETUP
• Touch COPYRIGHT INFO
• Touch ENTER COPYRIGHT INFO
• Type 11 keystrokes HELLO THERE
Total: 16 button presses or keystrokes.
Less than a quarter of the effort of button-only system, and less than half the effort of a hybrid system.
It must also be pointed out that this example totals the MINIMUM count of button presses & keystrokes; it does not account for errors. Going down the wrong menu path can waste a lot of time and add significantly to the count, to the point where it's easier to just exit the menu system and start over again...a fully implemented touch system greatly reduces the time spent recovering from these errors.
Admittedly, entering copyright info is not something that is required that often, but it does illustrate how time consuming the usual button interface can be.
Modern digital cameras have an amazing amount of functionality, no doubt more functions would actually be used if it weren't so tedious to do so...