Yeah, the DX models didn't come with Power steering...
Or a Tachometer, 4-wheel disc brakes (front discs are smaller diameter too), wheel covers, power options etc...

The rust in the rear quarter panels is not nearly as much a problem on DX models as EX/LX models, as DX's didn't come with a sunroof, and therefore there are no drain tubes going into the rear quarter panel area to contribute to rusting...