Originally Posted by Doug64

Actually it is a plus. The star nut does not add significant strength to the steerer tub; its main function is to adjust headset bearings. I'm assuming an alloy steerer tube. Having the headset uncut allows more options on bar height. It can be cut once it is dialed in. I leave about 10-15 mm of steerer above the stem when I cut the steerer tube. You can always cut a little more of if you don't like it, but you can't add it back.

My daughter has been riding for a year with about 25 mm of steerer tube above the stem. Now that she has the stem exacly where she wants t we'll cut it, still leaving a little above the stem.