I have watched my field planted the last two years, I have watched multiple other fields planted. I have hauled seed to the planters and filled the boxes.. Unless the "plume" of coating dust is not visible to the naked eye while the planter is in operation, I have never seen it. I DO see the dust in the bag, and in the planter boxes, but it is usually heavy enough that it does not float about in the air.
This year the ground had JUST enough moisture that there was not even a plume of "dirt" dust, so I would think any plume from the seed coating would have been much more visible.
To me it comes down to this.. Before the coatings farmers sprayed, and there were a lot of deaths of bees involved immediately, and in the following weeks. After the coated seeds, those deaths stopped happening.. Combining the chemicals from the coated seeds, 2,4-D and all of the other herbicides, fungicides and insecticides, as well as mitacides... may well make up the difference in an over time decline, as opposed to an instant one.. but at least now, "I" have the opportunity to get some of those older combs out of the hives to reduce the exposure over time.
I am not defending anything, just posting my point of view as I have seen it. My point of view on this issue is constantly changing. I am too close to both worlds, both sides of this story.