I'm curious about what prevents the manufacturers from running badblocks and eliminating some of the downstream pain. Obviously some users care and will spend t

I'm curious about what prevents the manufacturers from running badblocks and eliminating some of the downstream pain. Obviously some users care and will spend the effort to check their drives, and some unlucky users will have a data loss and a bad experience. Is not running badblocks before shipping a way to exploit users who won't RMA or won't realize their drive is busted? Or are drives getting damaged in transit? Or something else?