There seems to be a line from what you're saying about Ballard to someone like Bret Easton Ellis
there definitely is. the flat, affectless, lack of emotional resonance. the endless literal lists of physical objects, clothing brands, etc.
I think the difference is the unreliability of narrators. the threat in Ballard is usually from without - society, technology, climate
in Easton Ellis the threat is from within - ennui, cruelty, psychosis (maybe)
Ballard's protagonists are usually engineers or doctors (right?), something practical. Patrick Bateman is a Wall Street bro, others are writers, models, film producers.
there's a difference of wealth too. Ballard characters are upper-middle class professionals. EE characters are monstrous idle rich.
they're both delineating the same heart of darkness tho, for sure