It'll help you improve skills which are important to professional development and employability:

• the knowledge and intellectual abilities to conduct your research
• the personal qualities to succeed in your research and chosen career
• the standards, requirements and conduct of a professional researcher in your discipline
• working with others and communicating the impact of your research to a wide range of audiences

All you have to do is plan these activities alongside your doctorate, documenting and reflecting your journey to success along the way.