I just threw away an Osram "15000 hour" LED light bulb that I installed 950 days earlier, which by my estimate only served a third of it's rated life at best. https://twitter.com/martyvis/status/1390590392773472261?s=19
All are still working fine for both of us.
I went around after installing them and measured their light output. A couple years later I went around and measured again, and there was little or no detectable reduction.
[1] they were a particularly good deal because the electric company here and Walmart had made some sort of deal that marked the 60 W equivalent and 40 W equivalent bulbs down to $0.17 each.
Also note, these are spotlight LEDs that in the past were halogen, and not your standard sized lightbulbs, which are probably a few generations ahead in terms of manufacturing.
As this video says, Philips don't even make these bulbs with GU10 fittings, probably because they can't achieve the necessary reliability.
Still, everything noname I bought around the same time is either already dead, or just doesn't have as pleasing light quality.