There are daily cases where everything else fails and only high budget geometry offers a way.
Most prominent example in use for archviz is to look through windows, into a room or a tunnel, hole, a portal of any sort. It's so often used that's become banal and surpasses use of clouds. Cuz when one is occupied, there's rarely time to invent and after, old habits die hard.
It would also makes it easier/cheaper & faster to animate far-away/mid to low LOD objects (use billboards instead of 3D), even representing surfaces under water/in volumetric objects... to ease and speed up actions which are repeated most often is where most benefit is coming from.
Imagine rooms scattered over houses, blocks & skyscrapers, then buildings & skyscrapers scattered in back... or it could even be starting w/ grass, bushes, trees, animals, ppl... whatever entourage comes to mind. IIRC, ages ago there was a 3DS Max plugin which also provided whole library sets supporting such workflow.
Somebody surely remembers...?