The problem is that the manufacturers lie and say that the LED bulbs will last for many years when they don't.
The claim they put on the box is typically true, but based on some damn modest usage. (e.g. 3 hours per day in ideal environmental conditions) And of course, a mean-time-to-failure figure to someone with one bulb built with minimal QA is just a dice-roll when faced with the bathtub curve of product failures.