Because wild populations of bees are affected too.
From a strictly utilitarian point of view, that reduces biodiversity, which increases the risk of disease. The narrower the gene pool, the greater percentage of animals could be lost to a particular virus or bacteria.
From a broader perspective, it would be a bummer of a world of the only bees are managed colonies that are trucked around from farm to farm. Goodbye to fields of wildflowers with bees buzzing around, and goodbye to all sorts of wild plants that depend on wild bee pollination.
From a strictly utilitarian point of view, that reduces biodiversity, which increases the risk of disease. The narrower the gene pool, the greater percentage of animals could be lost to a particular virus or bacteria.
From a broader perspective, it would be a bummer of a world of the only bees are managed colonies that are trucked around from farm to farm. Goodbye to fields of wildflowers with bees buzzing around, and goodbye to all sorts of wild plants that depend on wild bee pollination.