Because everyone's been telling you the same thing in a multitude of different ways, but you refuse to get the point. Yes, the operation of the software we write can be affected by the physical realities of the hardware we use to execute them, but any time this causes the software to behave differently than it would in a purely hypothetical computer, this is considered an error and the results invalid. We even have hardware that automatically corrects for when rare events such as freakin' cosmic rays cause the value of a bit to flip (ECC memory).

The domain of software engineering is abstracted from physical reality. There's nothing useful to be gained from such discussions, because the whole job of hardware engineers is to enable us to operate at a higher level where we don't have to concern ourselves with the quantum electrodynamics necessary to make the transistors do their jobs.