Photogrammetry: what's represented if it's turned OFF

What exactly is being represented in cities with have photogrammetry available, but it’s being turned OFF?

Autogen by as well as what ever place of interest was crafted for the city (i.e the empire state building in NYC)

The ai does an okay job for the most part but it lacks a lot of the detail of the photogrammetry.

Cheers, Ed