Finman mentions, "To keep my mouth sometimes shut, it has never been one of my best virtues"
We would love you less if you were more virtuous, Finman. You ask good, tough questions, even if you are a leathery old cantankerous iconoclast.
My own view is that it is good we have a variety of approaches. I am one of the leave-alone natural beekeepers you like to tease, who looks for local fitness (a well adapted landrace of bees), then there are hard-line conventional breeders of pure races, and everything in between. We all find problems and share these and learn from them. We would learn so much less if we all did the same thing. The important thing is to admit mistakes and listen to others.
I think people are missing a point, slightly. As usual with VSH and natural selection, people are talking about slightly different things. Most of us leave-alone beekeepers are not so interested in honey, and crucially we do not move hives to follow crops. We tend to have them in a small back garden. So we don't want mixed-race bees... if someone begins using Buckfasts or Carniolans in my village, everyone's bees will be hot for a year or two. In my particular area, I don't want a fast Spring buildup because there is not so much forage in Spring here (few fruit trees etc). But the bees I have seem to get on OK without treatment; they make a little honey, which is OK for a back garden hobby; they seem to adjust their brood rearing to match the nectar flows as if they know what the flow will be in a few weeks. I am learning to reduce their swarming. For Finman, they are rubbish bees, but they are suitable for my use.
If I was a migratory beekeeper I would be more interested in large colonies in Spring, and stimulative feeding. If I kept the queen laying, I am not sure my bees would still be varroa-tolerant. If you want really varroa resistant bees, I suggest you look at
Swindon Honeybees - where Ron Hoskins has been selecting for truly varroa resistant bees for much longer than LASI etc. He is a conventional beekeeper and his bees are managed like you manage your own, their VSH is very very strong.