This means you can each earn points separately and book (and sit) together, instead of having to jump through hoops to book separately using rewards tickets on the same flight. (richmondsavers.com)
In addition to using points to book rewards tickets, you can also use your points on travel partners. (upgradedpoints.com)
If you are only checking economy - class reward ticket prices when you search for flights, you'd never even know this. (creditcards.com)