The answer is simple "Two minds are better than one" Walkthroughs and reviews would let us see our work in different perspectives. This would lead to know the various mistakes we did or technically the defects in our work. This in turn would help us make our work product of better quality. In turn lead us to be a better professional. What say?
Its always better to get our work reviewed and take the feedback in a constructive way... be it testing or any other discipline...
