“However, this does not extend to items like cars...”
That is the one for an ordinary person which really matters.
Who tries to repair a planned obsolescence and even no longer supported product like a phone ?
The issue is not for planned obsolescence items but for those items that the manufacturer claims only they can repair. If only the manufacturer can repair it, then you really don't own it and are chained into a long-term service contract with them whether you like it or not.