Then we need a faster and more accurate culturing process. At least from my experience it was neither of those things, and it's hard to say we should leave someone with a potentially deadly infection to lay around for a couple days while trying to figure out what bacteria is infecting them.
It's going to be costly but we're "back-loading" our medical process so that we leave the problem to the next generation of healthcare providers.
It's like we want everything for free - get sick? just give out a ton of medicine! Eventually we have to pay for it.