OK, I just finished reading the article on Britney and I have one thing to say: the writer does not know how to right a proper article!
So Britney did not sit down for an interview with the magazine (props to her for that, btw!)... it is not the end of the world. The writer had no idea what to write for her article so she describes her cobb salads, her boring husbands, etc... If your subject decides not to give an interview...BE CREATIVE and make something up, you are a writer after all!!
The reason I think it's best that Britney did not give them an interview is because I think that she's tired of being used by everyone. She knew that Allure would simply take her words and turn into whatever they felt was proper with the public's perception of Britney. I highly doubt that they wanted to write her comeback story for Britney's benefit (as the letter to the editor mentioned) - they wanted a comeback story so for their own benefit (ie., $$$).