Dynamo lighting seems to be more and more useful, the less and less you use it. If I were commuting and keeping regular hours, I could easily have some system for recharging and swapping batteries. But if I only need the lights very rarely, and especially very unexpectedly, then dynamo lighting is very nice, because it is always ready to be used. It is zero maintenance, so looking at the use : maintenance ratio, it can be worth the bother with a very low usage rate.

For a similar reason, I keep a dynamo powered flashlight in my car. I almost never use it, but when I need it, it is always ready. Every time I tried keeping a battery powered flashlight in my car, by the time I actually needed it, the batteries were not only dead but had leaked toxic goo all over and destroyed the flashlight too!

Probably bottle dynamos are a decent compromise. You can still swap wheels easily, they're cheaper, absolutely zero drag when not in use.

I have hub dynamos on a couple bikes and a bottle dynamo on one bike. One fun feature of the hub dynamo is that the lights can turn on automatically, which is nice at dusk or when going in and out of deep shade.