You're ignoring the point of my original post. The objects first reported were not saucer-shaped! The entire myth of "flying saucers" is based on a reporter's mistake.
No, you said you didn't think there was an advantage to a saucer design, and I just pointed one out.
As for your history of "saucer", it's pretty much as I remember the story.
I did pull up the clip of the radio news report of Roswell, six weeks or so after the Arnold "close encounter", and the report used both "flying disk" and "missile" for the recovered object.