In warm weather, when they are foraging, a worker lives 3 to 6 weeks max after taking her first flight. That doesn't leave much time for adapting. You may go into the hive 2 or 3 times during that time. With 1500 or so new bees emerging daily, you will always be with bees that have never seen a human. So what if 30,000 bees don't sting. The 1500 new ones coming out today is more than I want to be stung by. :shock:
It is the temperament of the bees, not the adapting, that determines their actions and reactions.Both the overall temperament of the strain, and the present temperament, caused be weather, disturbance, ETC.