I disagree, in the context of the post (human society and development over thousands of years), then I read that as "free time - better agriculture" and "access to drugs - medication to improve quality of life"

I can see it as being taken either way though

Increased productivity over time hasn't correlated very well with the amount of free time people have, and there's always been room for tinkering. There were especially large amounts of free time pre-agriculture.

And I wouldn't put advances in medical drugs particularly high on the list of advances either. It's not even the top of the list of medical advances. Though I don't classify vaccines as drugs.

I meant psychoactive drugs.