I guess I was expecting something that would show why you'd want a dyno system vs. any other type of light.

What we got was:

1. I didn't have lights on my bike or my person.
2. It got dark.
3. I had to ride home without lights.

I understand the advantages of dynohubs and why the OP likes them but you could easily take this story as a reason not to advocate for dynamo lights. Because the OP is sold on them and because they're on the expensive side, especially if you need a custom wheel built, he didn't have any lights at all on that bike. A person who wants lights for night riding and is fine with battery powered lights probably would have.