Something I've not seen an answer to in any article about this concept: I'm slightly above average height, so occasionally people somewhat below average height ask me to reach things down from high shelves in supermarkets.
More questions somewhat in this same vein:
Can you take your family with you? What happens, if your 5-year-old grabs his favorite sweet and brings it up to you to ask you whether he can have it? Can you put things back into the shelves?
What happens if I do that in an Amazon Go shop?