Its obvious they said its likely caused by drivers to try and ease peoples worries, that is standard industry practice. At the point of that statement, they clearly didn't know what the problem was, perhaps they do now but haven't released a statement confirming anything.
Some people are very sensitive to stutter, and some aren't. And it clearly only affects some scenarios, so it will not always be obvious.
I maintain my point though, a problem which affects a minority of single gpu users, is worse than a problem which affects a minority of crossfire users (a minority of a minority)
Following that logic, the minority of people who have suffered injury in a car accident and lived is worse than the minority who were decapitated in each incident