Important caveat: it's possible that if these reactions were counted, then 2 wouldn't be enough to get into Primal's trending feed anymore. But it often only takes 1 reaction, so it couldn't be too far off.
My DVMs still count them. They are available in primal. At least those who are not personalized.
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Reasonable not to include personalized ones since some aren't actually meant to be positive
They consider things like your followers etc. It's simply not possible on primal as users don't communicate with the DVMs, but the caching service does.