For some clients who aren't very computer savy, they will probably not know to click on the light grey right triangle or the row to open up the tasks which will lead to them not seeing any of the task descriptions that were included. I would guess the default action that most would do is click on the task title, which of course allows to edit the task title. Suggest adding a small button there instead. Or for the clients or invited users have clicking on a title to open the task. Because they shouldn't be editing the title anyways if they didn't create the task.