i said the same thing until these new ones. i'm hard on rims and these have been bomber. i'm 200 lbs and smashy.
Latest gen LB DH 35mm 26er ~450g
I've had a good run with them on my Nomad though. Long time/no smash. DH bike, not as good, but sometimes get a little, sometimes a lot; just like alloy.
Procore may be the answer for bike park and longevity of carbon rims. Going to give that a shot.