Buy only means buy if you can use the product as advertised after breaking all ties with the vendor.
Let's not broaden this definition in favor of the vendor.
Let's not broaden this definition in favor of the vendor.
Of course, customers would also need a way to transfer the content from their existing devices to later-purchased devices. If that is possible now, but becomes impossible later (like if Sony goes bankrupt), then does that ruin the "buy" characterization that seemed legit at the beginning?