This is helpful because many projects in the same workspace have identical subactions, and users cannot immediately see what project the notification is for. To see which specific project this notification is for, the user needs to click and open the notification to actually open the project to be able to see what specific project this notification is for.
For example, in a workspace named Design Projects there is Project A, Project B, etc. Each project has a subaction called Design Review. If there is a notification in this subaction from Project A and Project B, there will be two notifications both titled Design Projects - Design Review.