My point wasn't that the supplier wasn't a DG manufacturer, but that they were likely used to producing higher end plastic parts than needed for DG. That generally comes at a price.
The company I work for is usually looking for a level of quality/precision a bit below what would be required for automotive. If we go talk to an automotive supplier, we have the expectation of a higher price than from our usual supplier pool. Their processes are setup to achieve that level of quality. Aerospace is another step above automotive.
Other side of the coin, there are suppliers who are too quick and dirty even for us. Those
are the kind of suppliers who would seem like a better fit for dg.