True, iPhone users (sadly) have to wait for so many years for this multitasking. Jailbroken iPhone users have been enjoying it (and you can argue and side with Apple that it's finally done right or whatever).
I see nothing wrong with multitasking with backgrounder. If the jailbreak community can work around apple's blockade to enable multitasking, I don't see why Apple itself cannot implement it in some ways before this.
To their credit, they did it now. But that's all to it, a 'new' function that I already have years ago in my JB iPhone. Yay!