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Part of the above in my opinion is due to there being a far smaller gap between the wealthy people in the area and the poorest both financially and physically. A plumber, doctor and retail worker can live on the same street as homeowners. Not to knock the coastal cities too much, but contrast this culture to homeless people sleeping right outside a $3200/month flat, or primary teachers living out of their van, and you can see how it can have a different effect on those who are raised in those areas.
Supposedly there is some history behind this and people who want to be in the media business will actually learn to speak Midwest-style English. Can’t find the article though.
One of the things that always struck me here is the number of midwesterners I'd come across. It has long been my suspicion that Midwestern culture is better suited to creating companies that are highly collaborative and focused on value delivery. A great example to me is Atomic Object, mentioned in the article. They've been doing well for decades, and the couple times I've visited it seemed like such a sane place to work.