Somebody associated with the program (I can't remember who) let it slip that the hivemind is "evolving"; meaning learning to work better and using greater manipulation with the unjoined. Episode 8 was titled "Charm Offensive," and I for one was fooled that what Zosia said and did with Carol meant that Zosia was partially disconnected from the hivemind, but that was the offense of being extra charming, and was fake. It fooled Carol badly, as it did me.
So to make things clear, the finale opened with one of the saddest, darkest and most horrifying scenes in any recent TV show, with the girl being joined into the hivemind, surrounded by fake loving care from fake family and fake friends. After she was joined, the poor baby goat was left following the girl, who no longer loves it, is no longer human, and who has no family anymore, no culture anymore. All the bodies involved just go off and do the hivemind's intended actions. This scene makes "the joining" truly and deeply horrifying to a degree we have not come close to before.
On the question does sex with a hivemind body constitute sexual abuse or even rape, there's disagreement on reddit discussions. Everything we have seen tells me the individual bodies are just that, bodies in motion, and it would be sort of like abuse of a moving corpse -- or something. We have no suggestion really, that people are still individuals but trapped in their bodies and feeling horror of being moved around like a puppet. That would be a new level of horror to all this, if the writers go that way, but again, zero evidence of that.
This is a highly unusual, mentally challenging show, and they really stuck the landing of the finale very well.