Granted that the Taiwanese mirror does not have a good aiming system, and that far better devices are available, how often in real world situations does the more precise aiming mechanism actually make a difference?

I am a definite believer in signal mirror effectiveness, using them fairly often in non-emergency situations to indicate my location to others,but for those purposes, almost any kind of reflective surface will suffice, coupled with the two-handed aiming technique. I have never sent Morse code, or attempted to alert someone on the distant horizon, situations where really precise aiming would be useful.