Traits, why so limited?

Why is the trait list so limited? Is there any mechanical reason why you couldn’t come up with a trait that is not on the list? I’m thinking of Mouse Guard which has a much larger trait list.

Also, I noticed in r22 the Restless trait is still missing. I think it is easy enough to work out, but it is not in the list.

We covered the traits you can pick up in character creation and a handful of other ones that serve as examples. You are expected to make up your own new traits as necessary. See Winter Tales on page 101. The example involves awarding the “Tough” trait, which is not one covered in the Traits​ chapter.