People can grow vegetables and simply eat. But bread is way too complicated.
There is a bakers’ dozen of big steps to go from wheat into bread. And multiple special structures needed too.
Same with beer. Wine makes total sense but how do you even invent ale? How are these common foods everyone knows and uses?
I was thinking “imagine if mediveal people knew how to boil seawater and sell salt” and now I spent 20 extra minutes in the shower.
They also had more free time to figure things out.
They also didn’t have televisions, computers or phones to distract them. So they’d watch the stars or nature for entertainment and eventually, naturally see patterns and wonder what would happen if they applied those patterns for their own gain.
And less things to work with, so had to get creative to avoid diet fatigue (which is lethal) and only those creative enough people survived to create the people today.