Not if you rack your own and know where to leave the gaps. Some players know where to leave the gaps. If the rack is tight, the nine will not move unless it is hit by a banking ball. The break at nine ball has been broken for some time now.... 9ball: Anytime the 9 drops on a legal shot it counts as a win. So it makes sense that it's a win on the snap.
...
As for eight ball, there are reasonable arguments on both sides of "eight wins on the break". Again, I don't think the eight moves much if the rack is actually tight and its movement is very dependent on gaps.