I only need what 3 to 5 interactions in whole process.
1. Bring me to table (or let me find it myself)
2. Take my order (food and drink)
3. Bring my food/drinks.
4. Allow me to pay...
Could add one or two in between, but I don't see any reason why there should be need for anything beyond these basics.
I think this relates to America's NIMBYism: In the places where there is enough density to support this stuff, the sorting from insufficient housing has made too many rich residents that are not sufficiently price sensitive.
If we had abundant housing and thus poorer residents on average (in a relative sense), we would already have these labor-saving amenities.
The fact that cities are both more efficient and more expensive demonstrates just how fucked up the economics of all this stuff has gotten.
We're tired of subsidizing others' ludicrous desire for aristocracy role-playing when we just want to eat food.