funny thing is, in my training many moons ago, i was taught to use carby heat when needed only, as constant use can increase the risk of detonation, i was taught in Piper warriors, archers and arrows. i have only ever suffered a bout of carby ice on a long descent during a nav on about a 15 deg day after fog lifting- high humidity.
I will only use carby heat without evidence of icing on long descents in raining or very humid conditions.
There has only been 1 time i have had an engine stop on mid final, i set up the approach, pulled power to idle, and the prop stopped, i was flying a Jabiru at the time. i landed normally and rolled to a stop on the taxiway, after a quick check of the essentials, fuel good, no fire etc, i restarted with some difficulty, and taxied back to the hangar, first assumptions were carby ice, and not to worry about it, but i still removed the cowl, and found that the idle position throttle stop on the carby had broken off, allowing the throttle to close completly.
I would be curious to know why different techniques are used!