The cost of the devices isn't trivial, especially if you're trying to put one in each server's hand, plus it requires a reliable network to run on. It's not rocket surgery but it can be tough to get all the details right in a smaller town where your usual IT consultant is the assistant manager's boyfriend's uncle who writes websites and installs routers on the side.
I'm a computer nerd, and while I love restaurants that have their menu online with seamless takeout ordering, if I'm sitting down, I want to look at a piece of paper and ask a human if things are gluten free or not (and judge how much I trust the answer based on delivery).
I'll still tip 20% on takeout, though, because a lot of times that ends up going to someone who gets to spend their shift working a counter, answering the phone, seating people, etc, and not getting anywhere near the level of tips the servers are. That person will appreciate an extra $5 or $10 more than most.
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