These upgrade-shortcuts could introduce a significant increase in testing complexity if you want ensure that you can go from any system version to the current v

These upgrade-shortcuts could introduce a significant increase in testing complexity if you want ensure that you can go from any system version to the current version. On the other hand, with the current system people upgrade from Windows 1.0 to 8 (e.g. https://www.youtube.com/watch?v=8WP7AkJo3OE https://www.youtube.com/watch?v=8WP7AkJo3OE).