LEDs are pretty much immune to impact and vibration, incandescent lamps aren't all that tender either as the majority fail directly after a new set of batteries is installed. LEDs seem to fail either due to poor quality, not burning in the LEDs before using them, or failure to limit current. Most often a little of both.

The good news is that most every LED array keeps individual LEDs in parallel so if one goes the remainder still work. The other good news of LEDs is that if the output and numbers of LEDs is kept low batteries will work so long that spare batteries can be made unnecessary if reasonable precautions are taken. Many flashlight manufacturers have avoided this benefit by increasing light output so you get more light than is needed for less time than is desirable.