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.