If you're part of a record company, it's fair to say that you're a manufactured product. This applies to everyone (and in this case to Christina too). You're a product and you're selling a product. It doesn't mean that you're not talented and that you don't make creative and business decisions about what you will and won't do and where you want to go. Britney did everything in the past better than Christina did as far as achieving more commercial success. Their sales numbers do not lie. End of story.
Christina is just as manufactured as Britney. And I actually prefer Christina's songs over Britney's, but I'm just giving Britney credit where credit is due. Christina can meanwhile use her octaves to wail about never selling a million copies of an album in a single week in just one country.