I agree.
Your oil collects condensation overnight, which is the first thing to evaporate when you are warming up your engine. I don't like to come on boost when my engine is cold so all the crap would be going thro my engine(with the PVC valve operating). I have already experienced the following effects by blocking off the PVC valve- Cleaner oil, cleaner plugs , sh*t tins better fuel economy, no condensation coming out of my exhuast, cleaner intake system. from what I can see it does nothing at all to improve your engine just pollution control. I found a small screw fits nicely into the PVC valve and still looks standard.