Why is it important to keep one unfiltered view when using filters with Google Analytics?

Keeping an unfiltered view is crucial because filters permanently alter the data collected in that view. If you apply a filter that inadvertently excludes important data or is misconfigured, you lose access to that original, complete dataset. An unfiltered view acts as a backup, preserving all raw data, which is essential for comprehensive analysis, troubleshooting, and creating new filtered views without starting from scratch. Goals can be configured in any view, filtered or unfiltered, so this is not the primary reason. Filters are applied per view, not across multiple views automatically, so this is incorrect. There are significant reasons to maintain an unfiltered view, making that option incorrect.