@Mr-Smartyman well as soon as OTA 12 is out, you will have to close all apps to get to the "desktop" but maybe by OTA 13, you'll be able to get to the background by swiping and tapping, but I'm not so sure how thats working.
Its not a priority because I don't think many people will be asking to get to the "desktop" as opposed to other more pressing issues, or desired features.