Hardrives Mechanical hardrives wear out over time and get slower . This is that slight chirpclick sound that is always noticable on very old computers . Many cheaper Ssd ' s will also slow down if you have too much stored on them . OS Windows installs can have registry errors . The chances of these errors increase the longer the os has been installed . Malware This is mostly miss labled viruses but is usually installed accidentally . It can make the comuter very slow . <| sep |> You were responding to the question , Why should they ? not , Why would they ? By answering to ' why should they ? ', you ' re suggesting Apple has an obligation to be polite by your definition , which is to provide a more specific timeline than ' Coming soon ', as they are currently saying .