So this is why I prefer to dissociate file system access and transferring, with account syncing and management- they are mutually independent of one another. Apple and Google's reasons for applying their different file system access policies, differ as a result.
So it kind of comes back to what I initially said- iTunes is not for you (it isn't for everyone, myself included), and you should move over to Android. It gives you the freedom that you prefer. Using Apple devices to the fullest encourages a lifestyle change- in terms of the way you consume media, and the hardware that you use to consume this media. I think that those running a full suite of Apple hardware would agree that the interoperability of Apple's different hardware products, is second to none, and is a lifestyle choice to accept and utilise.