A flaw their cards have supposedly had in which NOBODY even noticed or cared until just recently, you mean?
This isn't true. We had a lot of posts last year and this year from people with exactly this problem. We have had reports of microstutter problems with AMDs crossfire implementation for many years. HardOCP reported repeatedly that NVidia felt smoother and that they preferred that implementation but without a way to measure it. TechReport showed fraps data that showed issues with consistency on dual cards 1.5 years ago and then with AMD single cards again 6 months ago. We have the videos from pcper.com which people clearly can see the problems in (over 90%). We have the videos from techreport which again people can tell the difference. We have many people claiming to see this in the forums, reporting problems and asking how to fix it. So many of them infact we have a group of people with their favourite workarounds (Someone ought to round those up and make a post so it can be stickied since its posted about so often). We have the 120v60hz blind trials that have shown that most gamers can tell the difference between the two, with 7970 crossfire we asking people to tell the difference between 30 and 60 fps.
We have made more progress on understanding this issue in the last 2 years than the 10 preceding it and pcper.com and nvidia's FCAT are a large part of that understanding. Its my opinion the problem with AMDs cards is largely the reason we made this progress, without that problem and many reviewers and users reporting it these tools would have largely failed to register because it would have been a tool looking for a problem. But because people did have the problem finding an objective way to measure and understand it has been a big priority.
You have to ignored everything going on in our industry on this issue to believe that "NOBODY even noticed", because its simply not backed up by the evidence and what we have seen over the last 1.5 years. There is tonnes of evidence supporting that people see these problems, and that the majority of people can tell the difference. Some don't care and some are in denial still evidentially but still the evidence is strong that people do notice. You might be one of the minority of people who can't, good for you since you'll always be able to run low spec cards and get the same experience some of us have to pay a lot more for. I wish I was happy at 30 fps, but I am not.