Not sure where you heard that, but I would say "hogwash". On the other hand, we try to use Velcro and the 3M adhesive hooks as much as possible, simply to avoid having a wall full of little holes after a few years of moving & changing decorations.
Former owner of 2004 American Tradition and several other RVs
Home is in the Ocala Nat'l Forest near Ocala, FL
Summers in Black Mountain, NC