A hammer is not a screwdriver. Is a hammer buggy or incomplete if it can't drive screws? No. Does it satisfy the requirement for a screwdriver? No. Is it a problem if you call a hammer a screwdriver and expect it to drive screws? Yes, for you. Not so much for the customer that had a bunch of nails and called them screws though.
It happens. It has happened. It will continue to happen. Customers will be delighted by the products they never asked for, customers will be disappointed by the products they asked for and never got. Whatever. That's business, and I'm an engineer. Whether that's good for business... meh.
Seriously, have you seen the Stanley FatMax Xtreme Fubar? I surely never specified that, but I still ended up with it in my toolbox. Sweeeet.http://www.stanleytools.com/catalog_images/mid_res/55-099_mid_res.jpg