By preventing independent repair, Apple can indeed prevent you from holding on to your device longer by just deciding it's totaled with no one keeping them hone

By preventing independent repair, Apple can indeed prevent you from holding on to your device longer by just deciding it's totaled with no one keeping them honest about it. It can also gouge you on parts and service even if it doesn't do that, as is true for any monopoly on any service. It also makes it harder for honest researchers to audit Apple's security claims, harder for independent hackers to modify devices they own, such as if they want to route around the incredibly high tax Apple imposes on developers for its hardware platforms, etc. The kind of control Apple wants to have comes with lots of profitable ways to exploit it.