system
Given the following post, respond as if you're commenting on Reddit:
human
[Fantasy] What purpose does a dragon "rider" actually serve?

The dragon does all the work, what good is some dude with a sword on its back when you already have a firebombing monster?
gpt
In most cases, it's probably that dragons in that universe do not have much tactical prowess beyond burning everything. So you have a general riding on his back, getting an amazing overhead view of the tide of battle, who can swiftly relay orders or apply searing, roaring, immolating literal *fire*-support wherever it's needed.