Reimian Empire

Sure, it's easy. Thomas would tell his life story to anyone who offered him a drink or asked him about it. His worldview is reflected in his actions, and that's enough.

So, to understand a player's character, the GM needs to go out of their way, send various NPCs to interact with them, and painstakingly extract their history and personality? It's not very clear from their actions, especially since people's actions generally correlate with their worldview from -100% to 100%. Well, that's just life, nothing you can do about it.
In my opinion, it's easier to write a couple of paragraphs of backstory.