Apple did start offering self-repair services a few years ago, but it involves renting nearly 80 pounds of equipment and requires you to use official parts. When all is said and done, it doesn’t save you that much money versus just going to the Apple Store. But if I buy a screen or a camera component from a third party, there's a chance my iPhone is gonna lock me out of certain features because it doesn't recognize it. This problem goes far beyond iPhones.