The other question some may ask is why do you need an OCC?
Simple reason is to maintain a high quality intake air for optimum combustion and power.
The recirculated vapours from the vents effectively reduces your A/F mixture from burning well so the ECU retards timing giving you less power. Almost like running 95 RONinstead of 99.
The other reason is keeping the intake path, butterfly valves, intake valves clean as these become gunked up with oil or tarry stuff from burning oil and affects performance of these.
Finally you may say why does Nissan not do it OEM. Comes down to cost, emissions and the end user!
Cost is obvious as its one more item to add on the production cost.
Emission; it's easier just to route the vented air in the intake so it's burnt and "cleaned than adding OCCs or other complex cleaning or catching systems just for the sake of a very small loss in performance!
End user; how many of us will like to maintain an OCC. ie checking/draining it considering it will have no regular filling pattern unlike a service schedule!
It's for these reasons alot of stuff on modern cars are compromised to fit rules/regs, different climates, fuels and the variety of the end user expectations.