Posting on behalf of customer
In engagements, users are able to target particular set of audience through segments.
But incase, if user wants to launch a particular engagement for audience satisfying certain criteria using a segment and a different engagement for users not satisfying the same segment, they need to create 2 segments with inverse conditions in both.
But if there could be a condition in Audience rules to select either audience satisfying certain segment or its inverse, it could be of great help.