I've shot more than 1,000 rounds out of my S&W 986 so far. I've never seen a single 9mm jump crimp, even low quality aluminum or brass. Granted my 986 weighs twice that an LCR 9mm does, but all of the major youtube reviewers have had no reports of LCR 9mm jumping crimp. I think that this problem is an exaggerated one to bolster the arguments of people who only prefer .38/.357 style revolvers.
Also, this is not the first time this topic has come up, and I've never seen a Firing Line member talk about how their 9mm revolver had 9mm's jump crimp. Mostly, it's people who own .38's and .357's who talk about 9mm jumping crimp. Or people who own .38's/.357's will tell you that 9mm moon clips are too complicated or will cause reliability problems. I've never heard people who actually own 9mm revolvers complain about how they have problems, just the people who don't own them.