Half of the listed smells of old Paris are hardly natural smells.

Anyway, I don't think people are being 'delicate'. Instead, as we clean up our act, smaller offenses become comparatively large, and just as noticable. The reverse of nose-blindness. For example, over the years, the cleaner the air in my house the more readily I can discern wildfire smoke on the air.

Most of the time nature is not particularly rank. The smells of pine or grasses or dirt are quite subtle.