You want to overtake. Why should you not do so?

You correctly identified that overtaking should be avoided due to oncoming traffic and because the road curves (the bend). In German traffic rules, overtaking is only allowed when it is clearly safe. Oncoming vehicles create a direct danger because you would have to enter the opposite lane, risking a head-on collision. Additionally, bends reduce your and other drivers' visibility, making it hard to see oncoming cars in time to avoid danger. Both factors together mean overtaking here is unsafe and prohibited, even if the centerline is dashed. The condition of the road surface, while important for general safety, does not by itself prohibit overtaking in this situation. Always prioritize clear visibility and sufficient space when overtaking.