MDNA is so pointless. It adds nothing to her discography.
The same for Let's Get To It from Kylie and personally, I'd move ARTPOP up to 2011 before Born This Way, not remove it. TF -> TFM -> AP -> BTW -> C2C is a much more organic progression to me.
Boy stop! I couldn't erase a whole Bey album if I was paid too. They're all essential and have birthed classic and iconic moments/dances/videos/looks. One of the few pop divas with an essentially flawless discography in terms of success, relevance, memorability.