> The problem was that many folks stopped taking it, when they felt better.
This really wasn't the problem. There was never any strong science behind it, other than just an abundance of caution. But you can also argue that taking antibiotics for an extra week is bad because it prolongs the evolutionary pressure on microbes to develop resistance.
Either way, stuff like that is inconsequential. Most drug-resistant strains crop up in hospice and hospital settings where immunocompromised or gravely ill patients are kept on a cocktail of antibiotics for months or years, and resistant bacteria have a significant advantage and can spread easily.
And it's not like we have a good alternative to that - "let more people die earlier" is not an easy sell.
This is possibly followed by overuse of antibiotics in animal husbandry, although that part is more complicated than usually implied.