We are all wrong, due to multiple posting of laughing emoji's, I researched the PCV. 1st - Its illegal to vent to atmosphere when engine is running, and for the most part the engine is sealed. The engine isn't perfectly sealed if you consider the atmosphere can penetrate through the valve guides and piston rings from the intake and exhaust manifolds. 2nd - The oil fill cap is sealed with an o-ring and has no pressure relief mechanism, in other words its a solid piece of plastic with an o-ring, not allowing atmosphere pressures or internal pressures to push through it. 3rd - The dip stick has an o-ring at the top and seals off the handle to the crankcase.
HSKR R/T, I might have misunderstood your post, I assume your referring to a vent as an open vent to atmosphere somewhere at the highest point on the engine. The Positive Crankcase Ventilation system (PCV) works with a one directional pressure relief valve from the crankcase pressure to the vacuum of the intake before the air filter when it overcomes the valve spring pressure. Therefore it is in all intensive purposes a sealed crankcase.
So back to the bean counters, they just want to save money eliminating the dipstick.