To be honest, it is your ability to do the task that matters. However, adding a badge of certification explains the fact that “yes you have proven knowledge & competence to manage the job skills”. Having a Tableau Desktop Certified badge does help you get preference in job interviews & land up better paychecks if we see it in a broader context. But mainly, it is your knowledge & skills that land you up a good & wealthy paying job. Focus on brushing your skills & getting the certification (in case you want to validate your knowledge) both.