Isn't that as true, if not greater, for the mRNA based vaccines, despite them not having that observed side effect? For all we know, everyone's butts might fall off because of them in the future. (yes, I'm being somewhat facetious)
My understanding is the that AstraZeneca and J&J are also new tech. Vector-based and mRNA are different than attenuated (weakened) form of the virus which is used in most vaccines.
(I'd be good if someone with more knowledge could comment)
