Draven
Pioneer
And you could also roleplay the same sarr traits while playing a human, but that doesn't help with immersion at all.
Sarr feel like a race, they have social trends and habits. Kyn seem like a stat block with prosthetics.
Just because Sarr have expectations and Kyn are a sandbox doesn't mean you can't make something with that sandbox.
If you don't want to create your own racial culture, please don't dump on the rest of us who enjoy the practice.
Edit: Put a different way, every kyn I know has their own incredibly diverse culture and traditions, often written by the player who made the character. It's easy to see a Sarr and have expectations, but the options available to a kyn means you actually have to get to know them in order to find out what makes them tick, y'know?