I, too, have treated dragoon as just a title, akin to "Ishgardian lancer". Similar to how you have different names for a knight in different cultures. Unfortunately, there seems to be a lot of IC dragoons in the drachen mail, which makes my character go "wtf is that" considering how alien it is compared to everything else. IIRC, there are NPCs called Dragoons and they're just in chainmail.
On the op's original point. I believe seeing stuff like a Miqo'te dragoon is like seeing a Caucasian samurai irl. There are a lot who don't play Miqo'te to the lore anyway (I've seen at least one Miqo'te who is six foot plus and built like Schwarzenegger, which in my mind is like trying to play a lalafell who is not gnome height)
On the op's original point. I believe seeing stuff like a Miqo'te dragoon is like seeing a Caucasian samurai irl. There are a lot who don't play Miqo'te to the lore anyway (I've seen at least one Miqo'te who is six foot plus and built like Schwarzenegger, which in my mind is like trying to play a lalafell who is not gnome height)