I find robot room service deliveries fascinating. Here is what I think about some of the things mentioned:
"Concern about a robot service fee."
Even though it's true many hotels and airlines love to charge fees for every possible thing they can think of I believe this would not be the case. There is no logical reason for charging a fee, not one I can see. Offering robot service room at no cost --it represents no cost for the hotel after all-- may well be a determinant of choosing staying at one hotel instead of another. At the end of the day, there is where the hotel will see the ROI.
"One of the things about robot room service that appealed to Sigrist is that he didn't have to worry about tipping for service ... tipping can be awkward ... You don't know when a tip is expected, or what's appropriate, and you may not have enough cash or the right combination of bills"
I definitely agree. I love the fact that in most parts of Europe there is no strong tipping culture as there is in the US. It would represent a constant problem --apart from the ackwardness,-- especially in northern Europe where cash is rarely seen, or carried.
"But I probably won't worry about rating it in the future. What's to rate? It's a robot."
Obviously, you are not rating the robot, what you are doing is something else. Rating the robot may be a way of contributing with collecting data that will tell how often the robot was used in a day/week/month/year. It can tell the peak hours when there is more robot traffic in the hotel, which may help in having more than one robot ready for room service, and definitely help in hotel management. It helps to improve robot room service; that's what the "rating" does.