One thought that this discussion raises for me is the question, "How helpful would it be to the bees if they were sheltered by a roof?"
I have found it interesting that Jeff Horchoff, "Mr Ed", from Saint Joseph's Abbey in Louisiana has a "shelter shed" roof for a number of hives (I think it may be about twenty hives). I do not know what proportion of his hives are sheltered, or how many are exposed to the weather.
Here in Australia, where summers can be quite hot, a roof could provide shade to protect hives from direct exposure to the sun.
Maybe the benefit in other places might be to protect them from rain. Another benefit may be to provide shelter for the beekeeper when inspections are done.
I imagine that this approach might have the greatest value when hives are set up in a permanent location. This might also be the greatest reason to provide "camouflage" from aerial observation.