My frustration with VW, and that of other owners around the world, is that things where reliability is poor don't get changed - they seem happy to replace poorly designed parts with the same again under the warranty and make customers pay for a sub-standard design if out of warranty.I would certainly agree with that point in regards to Caravan manufacturers, but car manufacturers are frequently making small changes which could be the result of reliability (and cost) issues.
Remember the old adverts in the '80s "If only everything in life was as reliable as a Volkswagen" - things have changed a lot since then!