Exactly. So its understandable they want someone with experience. At times it looks as if Alonso and Massa are driving different cars.
Other teams may be sharing more info; so if Massa is having a hard time getting the car to work for him... someone with less experience will find it even harder; considering its been tough enough to do it within a team, let alone each guy on his own.
Ferrari surely do share data, and have joint driver briefings, although unlike McLaren I think Ferrari and their drivers will make the decisions more independently, Alonso will still have private discussions with his side of the garage. I don't think Ferrari can get a driver more experienced in that sense than Massa, as he ought to be able to handle making the decisions, I think what Ferrari want is a more flexible driver than Massa, who will have to deal with Alonso cherry picking and having priority on design choices etc, doesn't need to be babied - which does come with experience, but also a confidence that I don't think Massa has fundamentally. Look at his relationship with Smedley, very "soothing", Massa started to achieve in Ferrari because the team supported him deeply, taking the time out to listen to him, work with him etc. Schumacher mentored him, Kimi wasn't too fussed and was beginning to turn his mind away from F1, but Alonso out works and out demands attention at Ferrari, which Massa needs to succeed (relatively more than other F1 drivers).