But a shaft can be a hinderance on one's swing.
As OB touched on, the shaft is by far the most important aspect of a club. Most clubs these days are asthetic based - basically, if it looks good to you, then use it because the one you hated will hit the ball just as well if it's set up for someone else. But the shaft is the mechanism that gets the ball airborne or not, gives you the distance you want or robs you of it and allows the feedback or lackthereof.
If you experiment with shafts you will see that there are HUGE differences, even between aftermarket high end shafts. Differences in torque, frequency, stiffness and kick can all be a positive or a negative on one's swing.
But once you have it dialed, it can really make the game alot easier. While having sound mechanics is also very important, of course, having equipment set up for your swing is also something that is often overlooked.
If you're crushing the ball off the tee, and consistently, you should try and set up all your woods with the same flex shaft. Find out the specs on your driver shaft and match up to that in terms of flex, torque, and kick. I also believe that because you play X-stiff or Stiff in your woods, that doesn't necessarily mean you play X-stiff or stiff in your irons. For some, they have a wicked swing off the tee, but are alot smoother with their irons and need a shaft that reflects that change.
And, shafts aren't a macho thing. If you find out you are a regular, play a regular. Don't try and over-do it with a Stiff or X-Stiff, just to have it in the bag. It will cost you strokes, I guarantee.
Learn to putt, get set up right and this game becomes a whole lot easier.
R35