Earlier quoted context omitted.
You seem to assume SF salaries will be offered in places that are also super cheap? Do you expect founders and investors to ignore the cost of living reality in Nowheresville just cause?
Why on earth would the value someone added to a company have anything to do with the cost of living where they live? Either you support remote or you don't but I would not expect different remote salaries based on where that remote employee lives. I know some companies do this, but I can't imagine it's a practice that will continue once remote work becomes the norm as it makes little sense.
This is precisely why technology companies cluster in hubs - not just SV but Austin, Denver/Boulder, Seattle, etc. and aren't more or less evenly distributed.
That aside, salary is determined by supply and demand, not solely by value-added. Value-added is a factor in labour demand, but it can be totally swamped by other factors.