When something is a black box (like an Apple device) users can't rely on the internal details, and the box's creator can't force you to, either.

"Laptop doesn't work for any reason at all? Send it in and we'll send you a new one!" You're at the mercy of the black box creator to help you.

When it's not a black box, the company might force you to be aware of the details.

"Laptop didn't work? Here's details on all of the internals for you to play around with, if those don't work then contact us"