Do you have any cite for that proposition? It is a violation of their UL listing.
Plus, a screw head driven at an angle is always going to be a violation as it leaves a sharp head exposed and yes, threads too. That is why smart boxes were created.
314.23(B)(1) 2011
(1) Nails and Screws. Nails and screws, where used as a
fastening means, shall be attached by using brackets on the
outside of the enclosure, or they shall pass through the
interior within 6 mm (1⁄4 in.) of the back or ends of the
enclosure. Screws shall not be permitted to pass through the
box unless exposed threads in the box are protected using
approved means to avoid abrasion of conductor insulation.