Exactly. It is a circular definition. It is ridiculous.
It will vary from country to country as to whether such consumer abuse is tolerated. There are two general issues.
- Is the actual lifetime reasonable?
- Has the company misled consumers?
Do we need to add “open navigation device” to the Purism product wish list? 
Your Purism products wish list Perhaps though a suitable cradle for the Librem 5, with appropriate software, would be adequate.