[phil21]

I think you highly underestimate the number of mistakes like this on the flight line.

By an order of magnitude it sounds like from your comment. Even if you get 99.99% reliability (good luck with humans involved) think of the number of flight movements per day multiplied by the number of tasks that must be completed.

This is why there are redundant checks and checklists and systems in place. To catch human errors, as absolutely everyone in the business will eventually make a trivial yet critical mistake.

Demanding individual human perfection is great, but you'll find you will end up with no workforce.