This feels like an AI trap almost. A lot of the badness comes from people who don't want/can't put effort into it, so we all get a deluge of the sameyness.

Or is it? Could it be the well established low-effort tendency when the dominant culture is shopping centers, vehicles, similar eating establishments, and the style of suburban housing to a large extent? That would surely encourage the LLM to emit in a similar manner. That sameyness provides a signal of comfort and familiarity.