The inbox has too many clicks and is confusing with the overview. It'd make more sense that, when you click on a notification, you get taken directly to what notified you. For example, if the status changed on a task and you clicked on the notification in your inbox, you get taken directly to that task's view. Then, the activity sidebar would navigate to that status change and highlight it. That way you get all the context you need, but the change you were notified of is highlighted and very obvious.

Having an overview that then requires extra clicks to see the context you need makes it more confusing and wastes time.