Why Do I Need a Portfolio?

Portfolio - relating to, denoting, or engaged in an employment pattern that involves a succession of short-term contracts and part-time work, rather than the more traditional model of a long-term single job.

Artist, Models, Writers all view their job assignments as being "short-term".  They actively maintain a current portfolio to assist in securing their next work assignment.  Most of us think of our job as a "long-term" assignment. As a result, we do not tend to keep a current portfolio.
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Question:  In God's eyes, are not all our work assignments "short-term"?  Then, perhaps, if we are looking at our work assignments through God's eyes, we should focus on keeping our portfolios current as well.