There's a big difference between Eastern Oklahoma and Western Oklahoma.

GP's description sounds like Eastern Oklahoma which is more similar in landscape and vegetation to places in Arkansas and Missouri like the Ozarks.

Your description sounds like Western Oklahoma. I lived there from age 12 to 20 and yes it's exactly as you describe, getting worse the farther West you go in the state. Dystopian agriculture.

Although Tulsa is east of OKC, I would put the dividing line between the East/West change in landscape around the Tulsa area.