Encourage different voices to contribute, and create a fair, inclusive process.
Work through difficult issues without tension derailing progress.
Keep conversations moving towards decisions and action.
Protect relationships while working through differences.
Let you participate fully rather than facilitating at the same time.
Independent facilitation isn't needed for every situation.
When it is, having someone who isn't tied to a particular position or outcome can be really valuable to help people work through ideas and options, and find a way forward.