Actually the main idea behind fmj and military calibers it to make an injury, not a kill. As it causes more troubles to an enemy. While in hunting the main goal is retrieve the meat (or trophy).
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I've heard that nonsense about that's why they went to 22 cal. They also said it tumbles, I liken that theory more, infinitely more damage tumbling or shooting off in another direction inside a body. Not too many survived a 30 cal to vitals. A fmj will penetrate objects like a 12 in tree as well, nice to know in places like the Ardennes or on a water cooled Merlin or Daimler.
FMJ rifle bullets give far more reliable feed on the feed ramp, when something is humming at 600 rounds per minute you don't want a mangled soft point.