You are correct in that the ways we commercially keep bees (our 'business needs') override the mechanisms honeybees evolved for defense against disease. Swarmi

You are correct in that the ways we commercially keep bees (our 'business needs') override the mechanisms honeybees evolved for defense against disease. Swarming is just one of many natural behaviors that enhances the bees' ability to survive. This paper from a prominent bee researcher highlights 20 significant differences between how honeybees evolved to live and how we keep them today, all of which reduce the 'exquisite fit' with their environment: https://www.naturalbeekeepingtrust.org/darwinian-beekeeping https://www.naturalbeekeepingtrust.org/darwinian-beekeeping