I have a bulb in my bathroom that I have had to replace every year or two. Meanwhile, in other rooms that I have renovated and I put good quality high-CRI LED downlights in, they're all still going strong after seven years.

I think the biggest difference is that these downlights have separate driver modules and a short wire to the lamp itself, which must make the thermal aspect a lot easier to manage. This also puts the electronics up out of the condensation.

The bulb in a regular socket in the bathroom on the other hand has the driver electronics there in the bulb, being heated by the lamps, so they're getting a lot hotter, and also it's there in the steam from the shower etc.