Sure, keyboards, buttons, and screens on computers also aren't essential, you can still buy brand new computers that are programmed by hard wiring your program

Sure, keyboards, buttons, and screens on computers also aren't essential, you can still buy brand new computers that are programmed by hard wiring your program into a plugboard ( https://the-analog-thing.org https://the-analog-thing.org )- but in both cases I think the utility is so reduced there are much fewer use cases where they are even worth having.