Considering that you do penance for tens, maybe even hundreds or thousands of year and then something is revealed to you, its infinitely precious.
why then would i not try to make sure to safeguard it ? the best way of safeguarding perhaps is penning it down somewhere safe , and then bind the pages in form of a granth.
rather we see the opp. the vedic verses were taught by the original seers onto their students in oral tradition, and those students then taught those onto their students and so on. But somewhere down the line perhaps there's a greater chance of missing out a laga-matra (matras of devanagari) of pronounciation .
then it really puzzles me why they were not written down at the time of revelation.
maybe 2 reasons :
1) paper wasn't available. writing on palm leaves was tough as it decomposed too quickly
2) perhaps they feared denigration of the paper used for writing.