I somewhat agree. The slashcut method is pretty effective and IMO, should be the only vacuum source on a boosted application. I would never route anything to the intake manifold because I have seen the shit that builds up in there. The one major flaw I see with that setup is retaining the stock black box and PCV valve. One should use block fittings to eliminate that bottleneck.

IMO, the Endyn setup is more than sufficient on everything except high horsepower setups. I would really like to see your theory tested in the real world to see if it can perform any better.