Program libraries are for people who can't code themselves

Operating systems are for people who can operate their system themselves

Thought frameworks and books are for people who can't think and figure out stuff themselves.

We have limited time and capital, so we create abstractions and frameworks and follow them so we can build further. Otherwise, we would still be trying to make tools out of stone because every person had to figure it out for themselves. This is a huge part of what makes humans different from animals like birds and fish.