When manufactured properly LED lights can last the life of the car - you only need to look at dash lights. However much of it is made to a budget and corners are cut heavily which is why they fail.
After replacing the bulbs in our house with LEDs, one of the brand kept failing every 3-6 months. Funnily enough, the cheapest brand bought from Quality Save has been the best - out of the 3 bulbs none of them have failed after a year. Also 3 Asda own brand bulbs bought 3 years ago are still working fine.
The one in the living room (can't remember brand but paid £6 - 1500 lumens - being the brightest in the house) has started to flicker after nearly 2 years.
I was told by electrical engineer colleagues that quite often the problem (at least with LED lights in buildings) is down to poor control gear/power modules as much as the 'lamp' part itself. And the more they are switched on and off over short periods, the worse this is as well.
Additionally, they said that lots of 'standard' LEDs in the home don't like being in harsh environments - high or low humidity, same for ambient temperature, e.g. cooker hood lamps, ones going in damp/cold sheds and garages, etc.
The wide variation in thermal conditions and humidity in car engine bays doesn't seem to be conducive either - so unless the units are properly shielded from the environment (or in the case of heat, have methods to dissipate it) and have robust electronics, then it's no surprise that they don't last anywhere near as long as stated on the packaging.
I must admit being surprised at how many previously well regarded brands are producing seemingly poor quality equipmenty these days, or at least (with cars) how many car manufacturers are happily specifying and installing such low quality kit in their cars whilst at the same time professing how 'reliable' they are.
Certain major parts might not need so much maintenance as 10-15 years ago, but if an increasing number of parts are part of in-in-one fitments that cost several hundred pounds to replace when the previous ones cost under £10, then to me that isn't an advancement, but a ruse to increase profits.
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