There are two crowds that are firmly entrenched in their preferences, the battery crowd and the dynamo crowd. The battery crowd usually haven't tried a dynamo setup, or a decent dynamo setup, because of cost and availability constraints. The dynamo crowd usually have tried the battery setup, they either stick with dynamo, go back and forth to battery, and very few dump dynamo and go straight to battery.

I'm in the dynamo light crowd, and I have battery setups. All the mode switching you do (1), all the battery charging to do, and all the light swapping you when you switch from bike to bike, and the worrying about battery life, dynamo folks don't need to do that, that one time $200-$300 (the $400-500 schmidt setup is completely overrated) investment is all they need when they build up the bike, and that last a very long time. (And when you're spending $2000-3000 plus on a bike, an extra $200 isn't much)

(1) I do have mode switching on my dynamo setup, I do it to adjust brightness, not to conserve battery life.