That's not correct at all. It doesn't matter if their healing spells only heal themselves. You can even throw Healthstone into this equation. I mean, you don't have to use your Healthstone/Warlock abilities, but if your partner is CCd it'd be pretty stupid not to use them. For Moonkins, if your partner is CCd or being focused and can't heal himself you're not going to be like "No, I'm dps...good luck!" Your original argument about being a pure healer is spot on though, and I agreed with you on that.