The creator/owner of a segment should be able to share edit access to others (not just read-only access).
We have teams of analysts that share responsibility for reporting. When one of them creates a segment, their teammates can't get access to subsequently edit that segment. Example: Some time after a segment is created, an issue is identified, or a request is made to update the segment definition. Within the team responsible for maintaining the reporting, currently *ONLY* the original author of the segment can make updates to it. If they're unavailable due to workload or they're out of the office, the request can't be transferred to another team member. The owner should be able to share edit access across their team so that a peer can pick up the work.