It's probably because they're so small, integrated and installed in confined insulated spaces. My house is 5 years old and I've never had an LED light break. The hardware I have is split into the LEDs (bigger ones with a heat sink) and the AC/DC drivers which are installed above the ceiling insulation or in a wall cavity for wall lights. The old school gu10 bulbs are notorious for burning out as well I used to go through about 4 a year just in a kitchen rangehood.