Another reason I wish iOS devices, and some other computing devices, were not so locked down: preserving our environment and resources.
The hand-wavy argument is, perhaps these business models are legal, but I don't feel our social and environmental progress is at a point where we can afford to have companies create "disposable" devices - "disposable" in the "long-term" of course, I understand iOS devices for example are supported quite well compared to average. And there is the problem for me, I don't believe "better than average" should be a valid defense for this practice. Yes, companies are entitled to end support of their software, leaving vulnerabilities in browsers or the OS, but on a locked down device, that can drastically alter its usefulness and its lifetime. Allowing customers who bought a device to repurpose it by installing their software of choice should be a possibility. A quick aside, I (sort of) get Apple's 7-day limit on side-loading iOS apps with a free Apple developer account, but my gosh does that feel petty and creates a sad barrier for creating fun little apps for a small group of friends.
And this issue has some subtlety I think. More than my (naive?) arguments capture I'm sure. One aspect is I don't know if these ideas would preclude the security model on iOS, which I very much enjoy, to be fair. I understand security, flexibility and a great user experience can be hard to integrate together, especially in an intuitive matter, but I wish Apple - and others - would try to find other creative solutions to some of these problems and trade-offs.
Another aspect is where to draw the "general computing device" line which would compel a manufacturer to have, somehow, a "long-term open device". Perhaps this would backfire and Apple would start trying to make a "non-general" computing device to avoid this sort of rule.
I just wish we could have it all of course: a great security model, ease of use but the flexibility to use hardware as we wish 10 years down the line. Hopefully people working at all these companies want this too, and I can keep dreaming.