Also everyone complains about punctuality. A train stopping "nilly willy" somewhere it's not scheduled can very much cause exactly that in such a tightly scheduled system. So if you can, you avoid it.

Since we don't know "the other side of the story", we can't really tell. All people here see is the "I got kidnapped". If the story was written from the control room person's perspective, they might write a fascinating story about how they single-handedly avoided 17 trains being late by sending one train on a detour.

Would be awesome if there was someone on HN that knows if DB actually has the capacity to run a scheduling algorithm for their network within a few minutes, repeatedly, for many different trains at a moments notice. What kind of infra do they have for that, what do they use? With a large, interconnected, network that's tightly scheduled already that can't be easy.

OP was also unlucky in that he was on a regional train. They prioritize long distance trains usually as a regional train can more easily wait on a lower speed limit track somewhere than a fast long distance train on a potentially shared single track bottleneck.