Why MS didn't make double tap status bar to sleep or swipe right to sleep yet

Why MS didn't make it
it's Cool !

double tap statusbar to sleep

Oy46h_medium

via imageshack.com


statusbar swipe right to sleep yet

Mju7_medium

via imagizer.imageshack.us


it's vote, please vote it : http://windowsphone.uservoice.com/forums/101801-feature-suggestions/suggestions/5991187-double-tap-statusbar-to-sleep-or-swipe-right-to-st