Yes, you are right to say that in the film days, post processing are rare as it is costly and require costly equipment, thus is not an thing people do. Neither do I, just take and send for development... good or bad. You views are not alone as many owners are looking at things today minus evolve, just like any social discussion topic.
But digital software did not appear overnight, through many years of creation, improved, published and finally with Internet, many people get to know it. Early versions of on the shelf digital camera was terrible catching lighting, color and WB accurately, that is where manufacturers produce software to correct it. Not to mention they are ultra expensive. Because of historical usage, post processing becomes part of the workflow you see today. And yes again to say that less PP (or no PP) will be required now as in camera processing is good.
Of course, there are the camera skilled people and the software skilled people aka craftsman and the engineers. Taking perfect picture at first shot is best, this is craftsman skill, while able to "make" a perfect picture from software is engineering skill. So which skill you want to perfect is your choice. I choose the later as it is cheaper and easier.
If I am not wrong, certain industries limits the PP to only lighting and color to retain the originality of the detail. Finally, IMO, PP is not just about changing color or adding test or removing spots, it is a skill of its own and investment too. When I look at real professional PP work, the output is stunning. Even simple HDR requires addon PP to create the difference, else just ended up with plain output.
Thus in the end, I would judge real skill as vision skill (able to find the angle), mind skill (capture the theme, creativity), investment (willing to go far and get the golden image) and presentation skill. For many, it is just a hobby.
i still a newbie btw.... tis question come to mind cas.... last time during film era... no PP was done.. and good photo still appeared..... so it was like... now pple using PP to beautify/corrected the photo they took... it like.. erm cheating??? jus my tot... is digital sensor cant produce anything near film standard?