A ticket comes in. Numerous tickets then follow all with the same issue. I link the follow-up tickets to the first ticket. But why?
Changing the priority or status or issue type or assignee of the "main" ticket doesn't change the issues linked to it. Responding to the main ticket doesn't send the response to the linked ones. All these changes have to be made manually to every ticket.
So, unless I'm missing something, why bother linking tickets at all?