Christine or Stevie: Who "writes and sings the tough lyrics"?

[TrueFaith77]

According to Robert Christgau, in his 1977 review of Rumours:

the cute-voiced woman [Stevie Nicks] writes and sings the tough lyrics and the husky-voiced woman [Christine McVie] the vulnerable ones

I don't agree (though I know what he means. . . maybe he's actually referring to who writes the "tougher" songs, musically).

I think Stevie comes off as "vulnerable" in the face of heartbreak: "Gold Dust Woman" being about people overtaken by heartbreak and the cocaine lifestyle; "I Don't Wanna Know" concerning someone of such sensitivity they don't want to confront the craziness that keeps love passing by, that's caused by the effort to just survive; "Dreams" portrays the curse (or represents a crystal vision) that her former lover will endure, to ultimately know that he made a mistake. This represents Stevie's sensitivity, like an open wound, not her "toughness."

Meanwhile, Christine seems "tough" in the face of heartbreak: "Don't Stop" represents sincere encouragement and well-wishes to her former love; "Songbirds" represents the comfort all the members of Mac can find in their musical compatability and ability to express their pain; "You Make Loving Fun" concerns the experience of welcoming love into your life; "Oh Daddy" displays a person taking responsibility for the wrongs committed in a relationship. That kind of self-reflection and getting-over-it strikes me as tough: a blues approach, no?, to healing. Stevie, to me, shows how a person can be wrapped up in heartbreak. . . with only her expressive tools, the magic and the music, to help her in "trying to survive." It's the combination, along with Lindsey's masculine neuroticism, that makes Fleetwood Mac's survey of love and heartbreak so . . . encompassing and compassionate.