It’s only natural for someone like Hulda to write about what she found and I am sure a lot of her patients actually got much better if not cured.
It is the same with MH as it is with fasting and all else that gives temporary respite to disease.
As for finding the cure for cancer, as long as someone on the other side is inventing critters like the mycoplasma fermenters this is simply going to be about playing catch up because all they need is to intro botulism into a wide spectrum of the population to allow these dormant critters to either start their work or become more effective while the body deals with the new disease.
And yes, time, money and access to info and perhaps willingness to alter ones view are the most important factor in all this.