A big benifit that is often over looked is keeping the oil out of the intercooler. Over enough time and generally sooner with extra boost that oil collects and coats the inside of the intercooler.. this can cause a degradation in the thermal ability of the IC to do its jobs.
Also im not sure where all the pressurized connections are but the oil will over time also damage plastic and rubber components. As rubber and plastics that are desingef to handle oil are built differently
Now both of these are mostly long term effects.