no one is accusing you of not caring for your pet's welfare. (at least they shouldn't unless you say so yourself) the point is, that if you talked to 99 people that had no problems, and 1 person that watched their pet die a horrible, slow, agonizing death due to impaction, I would think the 1 would outweigh the 99. Just remember, Sand in a beardie enclosure is for YOU, not them. Slate tiles, carpet, shelf liner, newspaper, etc etc etc there are a myriad of choices of good ground cover that have no risk of killing your beloved pet.
The one person who had a stressed beardie due to changing their environment was exactly that. Changing their environment. The same thing happens anytime you make big changes in a beardie's home. Relocation stress some people call it, but in that case I think it should have been called tough love, and should have been stuck with for the health of the beardie.
Sand vs. not sand is a much argued topic, but in *most* cases, the ones argueing for sand as being a "good" substrate like it for themselves, not their beardies. Dogs love chocolate, but we don't feed it to them. Same thing.