true but the VG has a very direct intake, without any kind of distancing tube and makes up for it with the diffuser disk which basically has the same role as the tube here.
in piro's case the intake tube's bends and length ensure optimal temps and air mixture, doesn't need a fresh air carb like most of the other single bend L shaped intake tube vapes for mixing. doesn't make much sense adding cold air to your heater either if you ask me, another win for piro.
looking at most other vapes i see nothing but screens between hot air and herb chamber and the shortest most direct path possible in order to prevent wasting energy. can't imagine any benefit to adding geometry inbetween for this sort of vape, only downsides is what i'm saying, besides the proper length and a couple of bends for air mixing.
That's true, though IIRC the principal behind the VG was designed to actually heat the diffuser from drawn in flame and then use that as the heat exchange medium, more than direct torch output itself.
My direct torch vape doesn't use any bends for mixing, some of the iterations added in fresh ambient air for mixing. It can be beneficial depending on the design, for example my flame intake doesn't get hot at all, I think all of the others I've used do.