i am a much bigger fan of chillblains then i am of CoI, but CoI's main point is in that 1 second before the inevitable cleanse it essentially roots the target for a second, which is useful for peeling. but you always have to CoI and then have an icy touch hitting right as the cleanse hits so after the initial peel the target is properly snared so your healer can make range, but i would be more then happy to burn two talents on endless winter if it meant it only cost one frost rune and one GCD to both peel and snare



EDIT: nevermind, stopped being lazy and tested it out myself on a targeting dummy, still overwritten, ah well, it was a nice dream