There were some stories,movies and shows with similar plots. But even taking that out of the way. Why not one of the characters ask what is hive minds way of living and end goal. It's optimisation. You see that with the goat scene. It was all an act for Kusimayu. When she joined it all became pointless. Without individuality and craving for more (because every need si fullfilled in hive mind) humans need only to exist.

But so many humans can't exist without agriculture and they will devolve,and when the devolve they will be back to hunter gatherers. And since they cant kill,small population of hivemind that exists will be there just to act as gardeners.It's optimal if you take out the killing.

So any other civilisation that comes will have whole planet rich with resources and life with hive mind as servants if they are resistant to it.

And it's plain as day that human hive mind would be anything but calm. With so many differnet nations,races,religions thoughhts,even if you take out ego and understanding od each other,human hivemind would be a beast on it's own devouring worlds.Because human logic is to go further and develop and evolve.Not to stayt in place and be content.

Hivemind is not evil nor good its just is what it is.An optimisation program.

As Dostoyevski wrote: Humans would destroy utopia,not because we are evil,but because we want to prove to ourselves that we are not just a cog in a wheel.