First my thanks to TRS for this thought provoking post. Regarding 2 stroke motors, the one thing that everyone can agree on is that EPA regulations were not designed for engine longevity. Oil usage has been reduced on Poo and Doo, Cat not as much, until the release of their new 600. Doo and Cat used DI to achieve the reduction, to simplify Poo dropped 2 oil injectors [CFI4 Vs CFI2].
Many people have reported an increase in oil consumption simply by venting the tank [Geo mod, aftermarket caps, direct venting] all these mods came about as a way to increase oiling to the motor and to eliminate a perceived oil starvation problem.
I have no doubt that the current stock Poo sled is precisely oiled and will give good service life as delivered and meet EPA requirements in the ideal riding scenario. That being said there is no room for error with a cap that has enough restriction to pull a vacuum, anyone who has owned a Pro or been around them has heard the vacuum being broken when opening the cap.
My previous 2012 600 Pro, when new, had an urgent recall done to remove a potential air bubble from the oil feed line, I watched the procedure, the first thing the tech did was to remove the oil tank cap before holding the pump open to burp the system.
I have read several instances of turning the sled on its side to service it, or removing the oil tank and introducing a fatal air bubble into the oil injection system, this then in turn starves the engine. Had the tank been vented the pump would have been able to burp itself and the bubble would have been of no consequence.
I subscribe to the thought that fairly lean ratio [50-1] is possible and still have a measure of durability. With the electronic oil injection on the horizon, this simple mod seems like a brilliant way to quietly overcome the handcuffs placed on Polaris's existing technology.