I think one of the things about writing in the studio is that the song hasn't matured, if you like, so quite often the vocals are early attempts. Whereas once you've taken it out on the road a bit, you learn more about a song.
In order to be rated as good as a good man in the field of her earnings, she must show herself better than he. She must be more steady, or more trustworthy, or more skilled, or more cheap in order to have the same chance of employment.