How is this not a critical fix? It's a huge miss that task updates and comments cannot be edited by the creating user. What if a huge typo is pasted into a comment??
One use case is a user is working on a task, and she uses an update to add key progress to task, but then needs to stop and resume work. Rather than creating a new and duplicative update editing the comments/update would enable this.
Also another use case is that users make spelling mistakes and need to update them.
This seems like basic functionality, and this is standard in other ticketing systems.