Because in our office there are 3 admins and we are using the Dashboard (with more than 500 test) on a Monitor that is 3 meters behind our Monitors, so it would be noticeable more.
particularly if there already some bad tests.
Report cannot say which bad item is new and which is not. Unless you have acknowledged the items.
I have added your request into "to do" list with low priority. Not sure when and how it can be implemented...