Apple has been sued and admitted it purposely slowed iPhones down. The company has since settled with the class actions and admitted this was the case.

https://en.m.wikipedia.org/wiki/Batterygate#:~:text=Apple%20has%20been%20sued%20and,admitted%20this%20was%20the%20case.

Aardvark

Occam's razor, if i was selling something, I'd want it to break and be replaced. How is that not pretty simple?

If you want me to have access to internal documents stating that people are intentionally acting in their own best interests, I can't provide you one from a current company. Although, again, if i was a company, I wouldn't be broadcasting that particular feature. 

There certainly is historical documentation of this behavior https://en.m.wikipedia.org/wiki/Phoebus_cartel#:~:text=The%20Phoebus%20cartel%20was%20an,an%20example%20of%20planned%20obsolescence.

AskSN

Is there a solution for planned obsolescence?

Yeah, gimme the actual planning document. If its _planned_, let us see the planners' idea. I'll wait.

(Per Occam's razor, it just seems an easier explanation to invoke (cost) efficiency or tech optionality)