True ... but It's the volume, not the pressure that increases as the engine ages. Additionally, as we've been seeing as our engines age, the PCV is getting clogged more frequently which is counter productive to burning off the additional volume.
To me it just seems logical to a) get rid of the valve & associated choke point (which I did with the oil canister) & b) maximize the volumetric capacity for the flow of those gasses to be burned off.
I'll be the first to admit that the chances of this making an appreciable difference is about 50/50. Worse odds didn't stop our forefathers though.