I keep my bees as "treatment-free". I don't treat for mites. I haven't had anything like AFB, but that would require drastic measures. I leave on plenty of honey for the bees and try not to feed at all. I use foundationless frames. I want to have "survivor" stock, but that might take a few more years.
The average colony loss in the US is around 50% last time I looked. It seems most people have good years and bad years regardless of the management. I've had years when all, or nearly all, hives have survived. I've also had years where all, or nearly all, had died.