Let's revisit this in a year and see. My prediction is at that point Google will be producing the most locked down Android devices. Motorola's we-will-prevent-you-from-needing-support practices shoehorn perfectly with Google's we-don't-do-support practices. It's a marriage made in heaven.
That's irrelevant. Apple sells you the hardware; when you buy an iPad, you are buying an iPad, not a tablet computer that happens to be bundled with iOS. There is no expectation that you can use it as a general purpose computer.
When I buy laptop, I am buying a computer. Full stop. If the vendor wants to bundle an OS, great, but I expect to be able to change it. It's far more offensive not to be able to run Linux on a mainstream laptop than not to be able to run Windows on an iPad.
Samsung is the factory contractor for the A5, Apple designed it and Apple owns it outright. Foxconn assembles Apple products and provides some off-the-shelf parts. Apple does not levy such licensing restrictions against another company's own product to run only Apple software.