Kahneman chose the names "1" and "2" because he asserts that those names are easier to remember than "autopilot" and "deliberate", and so don't require System 2

Kahneman chose the names "1" and "2" because he asserts that those names are easier to remember than "autopilot" and "deliberate", and so don't require System 2 thinking when you use them. I find that the confusion arouns these names undermines Kahneman's theory, as seen in this thread.