Wouldn’t that be akin to adding new features? Adding support for previously unsupported (due to their lack of existance) hardware is a feature imo.

Besides, while a program may eventually be bug-free, no modern computer has flawless hardware so creating a large program without bugs will always remain a thought experiment.

The only possible reason to do it would be if an alien civilization were to demand producing such a program or else they’d destroy Earth (similar to Erdős’s thought experiment with finding Ramsey numbers). Perhaps with all of humanity’s resources and a few decades this could be done.