Speakers with a different native language often retain parts of that language. They may code-switch from one language to another. Code-switching is another way of saying that the native speaker uses grammar patterns common to the native language, but used in the second language (English). In the process, one language may interfere with another. The speaker's age, education and social situation influence the efficacy of code-switching.
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(Excerpt from Communicating Your Way: Transforming Yourself -- Personally and Professionally, Bob Roza >> available through Integrative Speech, Inc.)
When you set a goal, you give your team a focus. They know where they're going and where you're taking them. Setting a goal avoids "surprises." Setting goals for a team gives them a chance to understand your expectations for them.
Being viewed as skillful or proficient in certain areas is important for your self-esteem. Having special skills and knowledge that goes along with it, is attractive and empowers people. This helps you to develop and maintain your own network (and includes the network of others). Others will want what you have.