Updated insight on this request from a similar request over here. View historical user activity - #5 by Jon_Sasala
"Use case: I am on a call with a client and they want to know what has happened on their project today. Pretty hard for me to look in Asana and answer that.
I see this as displaying similar to the feed in my Inbox but for all tasks on a project, not just ones I am following. And I would assume this should live under Progress > Activity in each project."
Please and thank you.