Were they?
So what?
Yeah and
@Polymath257 just told you what... We settled down in cities and started owning more then we can carry. We started stockpiling all kinds of stuff. A need arised to keep track of it. That's the origins of writing.
You seem to forget that homo sapiens existed for 100s of thousands of years already at that point.
If you would represent the history of homo sapiens on a 24 hour clock, humans only started writing and "building libraries etc" at around 23:30. So in the last 30 minutes.
What is your point?