“The machines don’t have babies or arrive late. If they get “sick” you can replace them. They don’t sue for workplace injuries.”
They don’t have bad attitudes, they aren’t rude to customers, act disinterested, etc.
That’s a big issue; in my area these places are staffed almost exclusively by foreigners (with Asians supervising Latinos), and the service is horrible. They aren’t rude, they don’t have attitudes; they just don’t speak English (often getting orders wrong - as often in your favor as not) and they have no problem letting you sit at the pick-up window for 5 minutes with 10 cars behind you - when you’ve ordered the simplest, most common items from the $1 menu.