This is an interesting view point. What are you saying, that everyone that used a wood oven in the past had a personal teacher? It's likely family members that used them passed thief knowledge down, but I doubt everyone had instruction....and even less access to information than today.
If you have no family member to show you, you learn from your mistakes
Back then when you burnt the entire batch of bread that was to last the entire week, I am sure you only made that mistake once
If you were an apprentice you would get a good kick in the rear. Just like when I went to culinary school. Never burnt croutons twice
Just looking at the thread of shame, we all learn from our mistakes. We even make the same mistake twice at times
Now we just run to the store or restaurant to replace what we massed-up. How spoiled are we