The cases right on the edge are real, but not common. All the examples I can think of are hundreds of years old and have no serious competition from digital st

The cases right on the edge are real, but not common. All the examples I can think of are hundreds of years old and have no serious competition from digital stuff, like eating utensils (for abled people, stabilized spoons seem to be a great invention for those who need them). What do you consider an edge case that should be mechanical?