Nobody knows when humans first started making predictions based on data. We can only guess it was long time ago.
None of us reads manuals, right? But having them with you might get handy.
Documentation is blessing when you want to hire new people to your team. Any kind of documentation. And that was so since the dawn of time.
Times change, but the need for comprehensive documentation is universal.
If cavemen did not decide to document their processes would we have Internet and mobile phones today? I think not. Start documenting your processes today if you haven't already. Document your data.