You are talking about a freedom before civilization in its modern form? While the pre-modern folks must have experience a for us unknown sense of freedom, they nevertheless were not free in another sense.
For the human race absolute freedom never was the case. Every circumstance you find yourself in, comes with certain limitations and restrictions, without exception, is what I think.

Technology altered our human world big time. In the face of such tech the requirements for our species to get along with each other adapted to the good and bad.
To have a document regulating the very principles was something, your grounding fathers were convinced, was needed. In order to know that the constitution was trespassed, you need to know its original words.

Just imagine for a while, such constitution would never have been written. Would you think that it would have lasted until today? And since you can go back to the source and read it, you can try to understand it on your own.
Mentality and expressions before modernity were given to the next generations orally but that habit shrank very much in comparison.

The lack of a sense of freedom cannot be experienced when it cannot be understood, I guess. All of us may carry something in us, we may call a common inheritance or memory. There is joy to it as much as there is a sense of loss. We nevertheless can be tricked by it.