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I've got 50,000 kms (just over 30k miles) with oil changes every 3k kms. I don't buy that there'd be significant enough delta in ring condition etc to make a measurable difference this early in the engine's life when it's been well maintained.
Regardless of the engine will deal with a pressurized crankcase because it's physically more tight and in "better condition" doesn't take away from the fact crankcases don't like being pressurized as a rule, regardless of if it will take it at this point.
While I was originally leaning towards going back to VTA because numerous tuners and folks have suggested it, I almost wonder if it's just the safer advice to give people because it's easy to screw up a sealed system install if it isn't done correctly.
I also have a 2018 STI. It has a boost rated oem pcv valve which blocks intake charge air from getting into the crankcase. It's something like 3/8th NPT iirc. I don't see why I shouldn't be able to order a replacement STI valve at the dealer, thread it into a female NPT to male barb adapter, and put it in line with a sealed can on the PCV side. I could keep the OEM pcv in the block too, even if it's sort of redundant.
I don't see why the above setup wouldn't work a valve known to be reliable for multiple hundreds of thousands miles on OEM Subaru applications (insert joke here about no boosted EJ25 cars making it that far lol).
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