PP is what happens after the "click". It takes the in camera "photograph" and turns it into a "picture".
It seems, that everyone does it today. From wedding photographers, to nature, to fashion, and everything else in between.
There are entire software packages - offering instant transformation of portraits - to stunning images.
Where do you draw the line ? Where does it stop to be photography and start to be digital art ?
Does all digital photography require some level of PP to make minor adjustments ?
The explosion of PP - primarily comes as an extension of digital photography offering everyone the unique privilege of owning a "digital dark room". An option available to very few in the film days of old.
Any simple PC can easily edit images with online free software. It is just soooo... tempting.
Professionals do this for their clients, (they are paying and we need to deliver the best) and all the rest of us follow suit. You can't tell looking at an image if you are admiring photography skills, or Photoshop skills.