Because we have the tendency to compare our weaknesses with others' strengths.
In my astrology book, Veil of Compassion (2013 release), I teach how the innate traits that you have, as determined by your astrology, will present what appears to be weaknesses and strengths, but it's important to realize that everyone's strengths are also their weaknesses and visa versa. Do not compare your apples to their oranges. Be uniquely you and do that well! No excuses - no apologies.