- To ensure you can always access the original data
- In order to configure Goals
- In order to use a filter for multiple views
- There is no reason to have an unfiltered view
Correct Answer: To ensure you can always access the original data
Analytics automatically creates one unfiltered view for every property in your account, but you can set up multiple views on a single property. Any data you send to an Analytics property automatically appears in all views associated with that property.
Read more here: https://support.google.com/analytics/answer/2649553