When many share a task, it important to alert someone by mentioning him through @name
I want to explain the suggestion further.
When there are many tasks shared by many people, there might be hundreds of alerts comming through discussion on that task. No any means to emphasize of important ones nor even those that are relevant to me.
By mentioning @my name, the alert can be red color any may apear in a specific list (my comments) so I can be focused and gove them priority.
This idea is implemented in the famous App wechat