Well, commercial feed in of itself is not always bad, for example harlan makes a complete diet for rodents. There is no professional grade commerical feed specifically designed for Bearded Dragons though. So right off the bat, your feeding your dragons an inferior food source.
More importantly 1) dragons receive a large part of their hydration through their prey and should receive it that way if possible. Baths, dishes, and spraying are not as good as receiving it through the food. 2) They are predators and one of the best stimulation they can receive is to hunt live prey. They never adjust to non-living food, they just have no other options because they are not allowed to hunt outside of their enclosure. Combine that with the poor nutrition and it's a horrible primary food source. It's fine to give an occasional supplement but there is no replacement for fresh veggies and live insects.
So many people are against it because it's inappropriate care for bearded dragons.
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