no consistency

 Arby's is supposed to have a measured amount of beef per sandwich. It's always less. I got a sandwich that was fat and gristle one time. Disgusting.

Bars use shot glasses that are about 3/4 Oz. 

Mixed drinks in bars may have 2 Oz, if the bar tender likes you. I've had a rum and coke that was mostly rum. Very stiff. At another bar the margarita was a mix with ice. Couldn't sense any alcohol. Maybe they forgot?

Can robots save the American dream? Can robots finally fulfill a universal need for consistency? No, they will be 'taught' to cheat the customer. It's a flaw of mankind. Humans are programmed to fail by an infinite being.