Basically software subject to license.
Media ownership I can understand, b
ut when it's an actual device like an iPod or an Amazon Kindle, control over how the device behaves should rest with the user. Amazon for example, is horrible about forcing device updates and limiting user access to digital media purchased from Amazon.com.
Don't you know its bad business to make anything that you can use for more than 5 years efficiently anymore? -_-
Try using any modern apps on an iPhone 4. Hell.. just upgrade the iPhone 4 software and OS to the most recent and you won't be able to use Safari without it crashing often.
Its a good business model to create software that forces you to upgrade your hardware to use it properly.(Not just an apple thing though)
I work at an ad agency and literally spend all day using apple products.. I couldn't upgrade our 2010 MacPros to Mavericks OS because "Your machine is not compatible with this software". Needless to say.. we now have "Brand New" 27 inch iMacs.. (a new retina display iMac was released 2 weeks after we got our new machines)
I don't even try doing anything important on my old Macbook Pro from 2008 now.
Its shady as hell, but its smart and all tech companies do it.
Deleting music is a different issue though.