A couple of years ago I was asked, at a job interview for an auditing role, which 2 of the principles I rated the most important. I went for customer focus and leadership. I toyed with continuous improvement but felt that wouldn't happen without the other two.
The only time these principles have been discussed with me were at that interview and as part of the ISO 9001:2000 lead auditor qualification process. So how important and relevant are they to commerce? As has already been pointed out, they're only tenuously linked to ISO 9001 and, even if that link were strengthened, it would be a brave auditor who raised a nonconformity about lack of leadership or inappropriate decision making. In developing and implementing systems in my current organization I consider the requirements of EN/AS 9100 and lean principles but have felt no need to refer to ISO 9000 or these 8 points - laudable though they may be. Don't good managers learn principles just like these at management school without having to buy a copy of an ISO?
I accept that they represent good practice but who's using them and would there be any significant change in the field of quality if these points along with large chunks of ISO 9000 and the whole of ISO 9004 were quietly dropped?