Because we act to fix things, others seem to follow. According to Keirsey, Mobilizers are often unaware they are leading a charge until they realize others are following them. If the followers prove unable to assist, Mobilizers are willing to terminate or transfer workers to improve efficiency. Apparently my personality type is rare, according to Keirsey's research. It might explain why I have a hard time understanding how or why other people tolerate disorder and waste.
Tests are tools for educators and employers.
I object to the idea people cannot change. I oppose the use of any form of intelligence exam unless required for a medical purpose.