Because it doesn’t fall in line with Apple’s vision for its ecosystem. Apple wants its users in an walled garden. They can do whatever they want, and have excellent experience, so long as they do it within the parameters Apple dictates. In part, the reason Apple can guarantee an excellent experience is due to the walled garden. Users choosing to upgrade/downgrade to various OS presents extra problems of compatibility and working correctly, leading to a worse experience even if it is user-induced. It’s why Apple forcibly downclocking older models was such a huge issue, not because they do it, but because it presented a worse experience over time.
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