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I never heard that one in all the time I have worked on cars including all the years I did it for a living.
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I know. We never used to think about stuff like that. Hell, in the '70s if the engine made 200k miles we figured it was a miracle. These days 200k miles is about the time a vehicle goes to the third owner.
Most of the thermac systems try to maintain a minimum of 90 degrees for emissions. But getting warm air into the crankcase sooner helps get the engine to temp quicker and helps keep water and blowby from condensing on the engine walls. And most folks are installing the PCV to "clean up" the inside of the engine, so why not go the extra step? It isn't going to make an engine run a million miles. IMO it's more like taking time to make sure the electrical connections are all clean if you're already replacing wires.