A question about AI generals

[ziegenpeter]

Command Stars represent the personal prowess of your general, not how good his army fights. They are thus much harder to get unless your general fights against the odds several times over. Instead, look out for the morale boosting traits, these represent the tactical, strategic, and logistic abilities of your generals and are much easier to get.

So this means the stars are less important than the morale boosting traits and even harder to get.
Then what are the stars for?
Sorry if these questions seem stupid but I'm not an native speaker of the english tongue and thats why I probably miss sometimes the point.