Honest question, what would prompt you and so many others to assume that the laws of thermodynamics are only applicable to isolated systems? Do you honestly believe that we don’t have a model that is useful for realistic systems? Like thermodynamics is only some pipe dream that. Vet actually planned out because we do not only have isolated systems?

Because actually the laws of thermodynamics are only applicable to isolated systems. "The second law of thermodynamics states that the total entropy of an isolated system can never decrease over time." But usually you can build quasi-isolated systems and minimize the external interference so it is negligible (i.e. a car engine). This is hardly the case of software systems though.