Okay, for example you say:
At this moment, it would literally be impossible for a billionaire like Musk to give away most of his wealth because most of his wealth is connected to his businesses…the only way he could satisfy Smith’s proposed moral directive is if he relinquished control of his businesses by selling off almost all his assets to other wealthy people.
This is objectively false. Musk could turn over ownership (shares) of his companies to his workers, so workers would own the companies. He could also turn ownership over to the State.
Less radically, he could just stop suppressing labor organization by his employees, which he is well known for. But this does not enter into the capitalist ethic because what counts as ‘good’ or ‘fair’ is whatever happens when someone acts in their own rational self-interest.