Edited Date Hover for completed items

I was happy to find out that you can see time stamp for items if you hover over them, but then I realized this does not work for completed items, which makes going back and trace past task very hard, is there a reason for turning it off for completed items?

Also, what do you guys think of being able to create two temp view you can toggle on and off to show date create and/or date edited?

Thank you!