why is one physical iPhone identical to another physical iPhone of the same model?
It probably wouldn't be if human beings had to drill holes in the PCB by hand, place and solder components by hand, and hand-machine the case.
different from my friend’s Xbox controllers even though they were the same model and supposedly manufactured the same.
This could be things like slight changes in the sourcing of, say, springs for an analog stick, composition of rubber used under other buttons, and actual wear on components of the assembly line, like the molds used for injection molding of something with a pebble texture. Not to mention, obviously, that each controller will break down differently over time depending on use.
It probably wouldn't be if human beings had to drill holes in the PCB by hand, place and solder components by hand, and hand-machine the case.
different from my friend’s Xbox controllers even though they were the same model and supposedly manufactured the same.
This could be things like slight changes in the sourcing of, say, springs for an analog stick, composition of rubber used under other buttons, and actual wear on components of the assembly line, like the molds used for injection molding of something with a pebble texture. Not to mention, obviously, that each controller will break down differently over time depending on use.