I find all rather amusing.
Ogg warned Nog not to use pigments from ground-up plants to make his cave drawings, because they were not known to have archival qualities. Ogg preferred pigments made of minerals, because of their durability and bright colors. Nog thought Ogg was not right in the head, because everyone knows that preparation of the wall surface was key, not vegetable versus mineral inks. Rather than spend a lot of time making drawings, they spent a lot of time arguing.
Both Ogg and Nog are no more, and time has erased every trace of their stick-people drawings.
Urg, who didn't give a rat's patoot which pigment was least likely to fade, used what he had and concentrated on becoming a better artist. His cave wall was discovered in France and is now very famous. Of course, Urg is likewise no more, and no one really cares about the quality of his work, just that there was work being done so long ago. His art has 'historical significance' but no one critiques it as art.
Although Ogg and Nog's work did not survive, they wasted a lot of valuable time arguing over who was right - and isn't that what's important?
Apparently.