Zoloft is mass manufactured in vats that produce thousands of pills each. Unfortunately the pharmacists that created Zoloft for Pfizer probably didn't see a lot of benefit from it. Zoloft saw supply chain issues in the pandemic because of "just in time" supply chain practices.

I feel like you're imagining boutique drugs in this conversation. Boutique drugs are made onsite, typically in small pharmacies that specialize in making that drug, and are made for extremely rare conditions. I think people would flock to the field to solve all sorts of conditions that effected them or someone close to them