I would agree that NC SD is a better place to live,
As far as recent Job’s influx to SCV (Valencia), There was that big Biotech Lab that moved from Santa Monica, L.A. City learned their lesson from San Fernando and moved a bunch of jobs and built new facilities just off the I5 on the way over the hill, then there has been a big influx of Defense work and contractors in the last three years.
So yes, not a small town anymore.
And I drive that route several mornings a week, I can see the traffic (not as much going north as south yet but there are traffic Jams now days).