A far as I know the card you are talking about is still in the planning stage. Staff showed the committee several different card styles at our last meeting. I believe they said it would be next year before they would be ready to roll it out to the public.
As far as the endorsement card goes, it is the CWI's prerogative to show it to anyone. The idea of endorsements was in response to customer's demands. Before the concept of endorsements was approved by the Certification Committee, the CWI wishing to take a different open book examination had to take all three examinations as if he/she had never tested before. I fell into that category many years ago.
The endorsement card provides the CWI with documented evidence that he/she successfully passed an endorsement (open book) examination. It is an easy way to meet a customer requirement that the CWI present documented evidence of passing the required open book exam. Prior to the endorsement card, the CWI had to keep the original test report issued by AWS when an examination was taken. The report included a detail breakdown of the test score. That might not be exactly what the CWI wants the customer to see if the test score was barely passing.
As I mentioned, it is entirely up to the CWI whether the endorsement card is offered to the customer. AWS has not changed its position that a CWI has demonstrated the ability to navigate a code. That is a skill that can be applied to any code. However, the customer has every right to require the CWI to demonstrate the ability to navigate a particular welding standard. One of the reasons the shipyards do not accept the CWI credential is that it doesn't meet ASNT SNT-TC-1A regarding the practical examination (NAVSEA welding and inspection standards).
The customer is paying for a service and he who holds the gold gets to make the rules. Contrary to popular belief, the CWI isn't the customer. The customer is the organization that hires the CWI or uses the CWI's services.
Best regards - Al