I think most people value education and generally seek it without compulsion (then and now). The idea of codifying the education requirements as law (then and now) directly serves that small fraction of people who would not have found education on their own otherwise. (Indirectly it serves us all because it saves us from trouble uneducated people end up placing on society.) I believe that the essential elimination of that small fraction of the uneducated likely would not have happened without the codification of educational requirements (as law), but that's a point we can't really prove one way or another. And perhaps that unprovable point is the root of whatever friendly disagreement you and I might have?

(It might be possible to do a comparative study of countries/cultures which have codified educational requirements vs. ones that don't-- comparing basic literacy rates to get some insight into this in the general case. It could be very tricky to factor out economics though. I know what I suspect the results would indicate. But I've not the time to do the study.)