The difference between newbies and experienced photographers is that the latter see a lot more in a photograph. The reason is simple. We have had to spend a lot more time looking at photos to correct our own mistakes and bring out what the technology misses. We have also seen a lot more photographs.
Despite the attitudes that some new photographers bring with them to this field, postprocessing is necessary for all photographs and it is not just to correct mistakes, but also to correct problems that are inherent in digital photography.
Minor variations in colour temperature mean that colours are often not correctly rendered by the camera. A beige colour may look white or grey. A purple colour may look blue. White may look orange, blue, grey, or yellow.
Processing is necessary to correct the colour.
Despite the overall shot being correctly exposed, areas of underexposure due to shadows for example will display either little or no detail or desaturated colour. Either problem requires postprocessing.
Minor exposure differences throughout any photograph result in minor colour differences too. A series of portraits of the same person, each with a slightly different skin colour would certainly not be acceptable, so here too postprocessing is necessary.
Some cameras tend to easily blow out highlights or produce harsh dark shadows. This often needs to be remedied by bracketing in combination with postprocessing.
I also recommend the picture puzzle books that are available in bookstores that show you two photos and you have to pick out 12 or so differences which are extremely minor at the more challenging levels. All the changes have been done in postprocessing and these puzzles train your eye to look more carefully at images.