On keeper bikes, I routinely make changes for aesthetics reasons. Why not? As long as it fits the budget, go for it. Small minor defects tend to eat at me, I am not satisfied until it looks "right" to me. On home restoration projects, I have gone as far as demolishing a finished repair and starting over as it just didn't look right (no one else would have noticed, but every time I walked by it, the defect jumped out at me....).