Reading this thread reminded me of an issue we had at our office.
For our office group, we had a commerical style coffee system that had 3 burners. It was one that you poured water into the top of the machine and then hit the brew button. The heating/brewing took a little while so lots of times you might hit the button before you finished putting the coffee into the filter or even putting the pot back on the burner.
But then they switched to a system that had water piped directly to the coffee machine and there was always hot water in the reservoir so when you pushed the button water immediately started. I think at least 10 of us got got pushing the button without either coffee in the filter or a pot under the brewer. But it only took each of us one screw up before we remembered.
Then I went to work in our office in Perth, AU for a while. I wished they'd had wall directions on how to use their coffee machine. I think the admin spent 15 min with me teaching me how to select my beans, and then my grind, the brew temp and size, milk selection, steamed or not, and then how to refill the milk or the beans if they were running low and empty the coffee grounds if needed. I was honestly slightly terrified of the machine for the 1st week.