When someone posts some comment to a studio, if it is not to your comment, you won’t take a notification.
So, before the change, to manage the comments as a studio manager, I had often seen the activity log.
But now, comment log on the activity is no longer unavailable.
I think the recent change makes managing comments much harder.
Because of the reason abobe, I suggest you to bring back the comment log on the activity from new studio.