If PG and Jessica were the "key" you could send them to Pittsburgh, Berlin, or Dakar and they could do the the same.
For a long time communities around the world have been asking YC to expand their business to new geographies. Except for China it has always been "talking to the hand". China didn't turn out well.
YC can't have it both ways: "we can only function in one place" and "we have some value apart from being in that one sacred place". COVID-19 may be changing this, but the contradiction is one for YC to resolve. The rest of us have to recognize a gap between what they have done (beliefs that seem to be implicit in their behavior) and what they say ("the secret to our success is...")