The position of First Lady has no rules, just precedent, so its evolution has been at a virtual standstill for years. If Martha Washington didn't do it, then no one is sure it should be done.
Shaw. . . has a woman ever asked you to write a poem for her?" "Good God, no," Gideon replied with a snicker. "Shaws don't write poetry. They pay others to write it for them and then take the credit for it.