The lifetime of Leds is meant to be very long, losing brightness over time .
LEDs have a general life expectancy of 50 000 hrs. If you use your lights for 10 hours a day, this should be 13.7 yrs
True, but do keep in mind you are on the wrong end of redundancy here. As an example:
If a twin engine airplane will fly on one engine, the odds of an engine failure related crash are roughly halved versus a single engine airplane - both of them have to fail before it's an emergency.
If a twin engine airplane
won't fly on one engine, the odds of an engine failure related crash are about doubled versus a single engine airplane - EITHER of them can fail and it's an emergency.
This setup is going to have, what, four hundred LEDs in it? And you're going to notice and be irked at the dead spot if one of them burns out.
The average life of an LED in a properly cooled, properly regulated environment might be 50,000 hours, but that's the average. Some of them are going to live a whole lot longer... and some of them are going to be the ones that pulled that average back down.
(That's my argument for trying to keep it user-serviceable, anyway. If you don't think you'd be bugged by one dying, maybe it's no big deal.)