Index coverage says "Indexed, though blocked by robots.txt". Those pages are no longer active and return 404 status. So that they don't get crawled and indexed, our SEO guys have been adding them to robots.txt.
Personally I believe we shouldn't do so because google will automatically drop "not found" pages from their index. There for we should allow bot to access the page instead of blocking via robots.txt
Please advise me if I'm wrong.