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I have been around internal combustion engines for over 50 years. I remember working on engines that had no means for crankcase evacuation, just a vent. Then the OEMs went to a road draft tube, then the PCV system.
I can tell you from experience the blow-by gasses mixed with the oil mist in the crankcase combined with condensation contributes to sludge build up.
Modern oils help prevent this but still getting it out of the crankcase is a good thing.
I can see by re-introducing it into the intake air flow it could cause build up on the intake valve with out the cleaning properties of the fuel washing over the valve.
I can see the value of the catch can, but can also see problems if it get full and is not emptied regularly.
It really boils down to educate yourself and make an informed decision.
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