We aren't born in perfection. I'm assuming we all live healthy lives already, but that's not gonna cure everything.
I understand my opinion isn't popular, or easy to accept. However, some people (including me) have mild or severe anxiety, are ruled by fear in their entire lives. Having drugs doesn't mean they can eliminate what is encoded in their gene, but it can make dealing with their emotion more approachable, that's enough.
ps: I do L-Theanine, which can be found commonly in teas.