The reason is that some people have alot of probs raising bd.
They are very renown to get impaction,caused more from food item too big,too many mealis,dehydrated or eating a pebble rock ect.
I think people don't like to put it down to their husbandry so they blame the sand lol.
In the wild they hatch in 1-2 ft of sand,first thing they do is lick their lips when they hatch.(1,sand in mouth)
Then have to dig through 2ft of sand (2,sand in mouth)
They live in the desert (sand) they eat of (sand)
Sleep in (sand)
Hibernate in (sand)
Dig and lay in (sand)
Wow they encounter alot of sand in their life hey,lucky they don't swallow any and get an impaction.