Well that's true, where they don't add value. What's the difference between the case of getting movie tickets and your waiter at a fancy restaurant? One of them is practically a useless annoyance, and the other one is part of the experience.
Someone in a movie box isn't going to tell you about the movie, or have a conversation about it with you. They are there to take the most basic info (movie, time) and money, and give you a ticket. It's also always done thru a thick bit of glass that makes communication sometimes difficult if not painful.
On the other hand, the fancy waiter will make recommendations. Will tell you about other things, and is generally part of the ambiance and experience of eating out.
Honestly, do we really like interacting with the people with minimum wage jobs? Not really. Most people seem to prefer the automated checkout, ordering on their phone, etc. While sometimes the person doing the job can be interesting, or friendly, even if the person is amazing, generally these jobs are pretty repetitive, and could be done easier, faster, and cheaper with automation. Not only for the employer, but the customer. Most of these people also are not thrilled about their jobs and be lazy, or do a bad job (I can't blame them really, you get what you pay for). The only thing keeping employees around was that automation was more expensive (and more unreliable). Now it's the flip - labor is much more expensive and unreliable than automation. Now people in those jobs have to prove where they add value, if it's only to watch over the machines.