As stated above, nature of the beast - life with forced induction. Not sure about the Raptor but on both my 3.5EB KR and 5.2L FPC you only really need the catch can for the passenger side. I check about every 1K miles and might have 1.5oz in the cans - so no serious impact on the oil level(s). My main concern was not allowing the oil saturated air flowing back through the intake and building up on back side of intake valve. This was supposed to be remedied by Ford with the 2017 model Eco Boost (3.5 non Raptor)engines by going with both direct and port injection...
oil pulled through the intake by the factory PCV system will never cause valve problems on the new EB engines since it has a port injector spraying the backside of the valve keeping it clean. This was HUUUGE problem with direct injected only cars like BMW, Subaru (FA20DIT), early Toyotas(lexus) ETC where they were DI ONLY cars and there was no port injector to spray the back of the valve clean. Our biggest problem is coating the inside of the intercooler with oil over time.
---------- Post added at 12:46 PM ---------- Previous post was at 12:41 PM ----------
the factory PCV system will have almost zero impact on engine life other than lowering the efficiency of the intercooler marginally at high mileage on a truck that isn't raced regularly. The catch can is a good idea because the intercooler essentially acts as a catch can in the factory system. Separating moisture from the oil vapor. But it has zero impact on engine life either way.
The reason we run catch cans on our race engines is because the oil vapor can cause a fluctuation on the octane rating in extreme extreme cases. and we need every scrap of intercooler efficiency we can get do to size constraints.