I guess I was being a little paranoid for nothing.
Cooper is an established, well known manufacturer.
I can only assume that from the good number of views this thread has received, if something was drastically wrong or dangerous, more people would have chimed in.
BTW (for the benefit of people reading this thread) written in tiny, barely visible text on the back of the all-plastic, white dryer outlet made by Leviton, it says that 8 gauge wire minimum is to be used. So It is unsuitable for those who have their boxes wired with 10 gauge.