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The reason they route it back into your intake is because the positive air pressure that brings oil with it has already been metered by your ecu. Venting to atmosphere or even seperating it with a catch can means that the ecu dosen't have the exact amount of metered air at any given time (pressure drop from catch can)... There are plently of people that don't change their oil on a regular basis, but think about a catch can. A catch can fills at varying rates depending on your driving/engine/etc, im sure plenty of average drivers would forget to empty it leading to plenty of oil all over peoples engines.
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