Marketing + "Clean Interface" = User Hell
I suspect marketing, aided and abetted by the "clean interface" movement, is to blame. The "clean interface" crowd's desire for software unencumbered by software is usually realized by either not providing needed functionality, as in this case, or sending the user on an Easter egg hunt to find it*. Marketing will want whatever silly sender name they have dreamed up to be displayed to the user; security consequences be damned*.
* True story: when my daughter took a reading comprehension assessment, she called me to assist because the site was broken. The text she was supposed to read abruptly stopped. After some fiddling, I discovered that the geniuses who designed the interface hid the scroll bars in peek-a-boo style so that if your mouse got close enough, you could find them. Unfortunately, time was a test component, so she scored artificially low. No, I did not put the work broken in quotes because the site was broken. It used a lousy design that made it more difficult than it should have been to use it. As another aside, I don't understand the desire to use sh*ty JavaScript components like that one when a native browser read-only textarea would have worked fine and been more friendly in screen readers for the disabled.
* A fair share of the blame for the success of phishing in general falls on Marketing. They make throwaway domains and email senders for promotions. In doing so, they educate the user that the communications source and website location for the company they deal with does change. An education that phishers are all too eager to cash in on.