Lordy Jed, no need to get your knickers in a knot over needles. The cold hard emotionless fact is that vaccination does usually involve injecting a complex mix of chemicals directly into one's flesh. This is not a situation that evolution has prepared us for. Even plain old saline solution injected into flesh can produce mild side effects. You say we understand vaccines in "enormous detail". Yet you conspicuously left out "completely", and well you should because it is well known that experts have said in retrospect regarding vaccines that didn't turn out well, that they have a lot to learn. You are emulating all too well the attitude of drug companies trying to sell their product. I'm happy that you're enthused about this product, but I'll pick and choose what goes into my body, thank you.
A bit like tatoos, except it does you more good health-wise