It still blows my mind how recent in history humans have been able to pass information into the future or across great distances. It’s amazing we know anything.
And why oral history was such an important part of so many ancient cultures.
From what I have experienced writing was important yes, but what they usually say is to have a teacher or a Guru. Whenever I read/recite the stotras/mantras the interpretation and the recital of it is so important that I feel a Guru is very important to understand the deeper meaning even though a description of it is present. In the modern world I listen to youtube to get the recitals/rythm right.
This is the same with cooking. My Grandmother had I think just one cookbook all her life. All that she learnt was practical by doing it from a very young age. All measurements and learning was from memory and if there were variations it would be derived from her already base cooking knowledge. Her memory of all these would be refreshed periodically because of the necessity to celebrate festivals with different types of dishes specific to the festival. For this it would not be one person slogging but a group of women get together to make the dish and information exchange would happen.