The trait itself doesn't do anything, it's just a signal for the player as to why he isn't getting a lot of command stars. The description will be more explanatory in the next patch.
In vanilla, you advanced towards more stars with every victory. Sometimes you could get a star every battle! We've made advancement more difficult, but even defeat can teach your general something. If your general is smart enough to avoid battle unless he's got overwhelming odds, he probably doesn't become a better tactician than he already was. Also, there are other ways to get command stars, usually through situational modifiers or advancing in other traits.
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