It's pointless when the vast majority of the world uses antibiotics liberally, unless you're into self sacrifice.
Most common bacterial ailments, like UTIs, are prescribed antibiotics based on symptoms, without working up a culture to pinpoint the specific strain, a luxury most of the world doesn't engage in, and respond well enough.
The Jase kits, advertised for years in every publication and website aimed at the very rich, includes a guide on how to treat in the absence of a medical professional.
If symptoms are mild and you can get to a doc quickly, great, but I'm not putting my life or the life of those I care about on the line assuming that's always possible. It's not.