Well, until some years ago we remembered dozens of phone numbers, birthdays, routes, physical addresses, due dates, etc.

The trick is to "give a tool for 1-2 generations of customers" , and then they'll be fully dependent on the tool.

1-2 generations? give an advanced anything to anyone with no true knowledge of how to do it without the tool and you'll have people fully dependent in hours.

kids today cannot navigate without turn-by-turn. nobody looks at the map to get names of major streets, they just blindly follow the directions. I learned how to navigate as a kid just by being bored and staring out the window and being able to recognize things. Now, kids don't even look out the window as they keep their heads down and eyes glued to a screen.