Originally Posted by
Kontact
1. Aesthetics.
2. The stack limitations imposed by a previously cut steerer.
You can't argue with aesthetics, if that's the motivation. But, the limitations from a pre-cut steerer tube are kind of throwing spaghetti at the wall. The 5mm spacer is only needed to accommodate 3mm of steerer tube that extends above the stem. With an epoxy plug, you could make the steerer tube flush with the top of the stem, and you'd gain 3mm of stack. That's a difference very few people would even notice, and it's a very low probability scenario.