There is no advantage, or need, to run cabin pressure to sea level; the majority of the world's population does not live at sea level. Some world population centers are there, and eventually flights landing there will have cabin pressures matching field elevation, as is always the case; to suggest that all flights should have cabin pressure altitudes that descend to sea level, especially when the flight may never actually go to sea level, makes no sense.
If you'd prefer to figure out world population by cities and location, cite each one, and do the math, more power to you.
I think you get the point.
How does increasing cabin pressure increase humidity?
Why do composite aircraft have more wiring than conventional airframes?