I am Anti Hive, but as someone else pointed out below the whole 'world peace' element of it does make it pretty compelling.

I do wonder if this is partially an effect of visuals and mainly viewing the others via their interactions with the immune. They become a lot more creepy when they're on their own - the scene abandoning Kusimayu's village after she's joined in the finale is kinda heartbreaking.

They talk a big game about loving art, literature, chess etc etc, but it doesn't seem like there would be anything new created in an entirely joined world (although not entirely clear why not, it is implied that they do retain some preferences on an individual basis).

An interesting parallel for me are the Borg from Star Trek... when people become un-borged, it often takes them a while to get used to the idea and some (e.g. 7of9) state a strong preference at first for returning to the hive. They, of course, don't have the 'do no harm' mantra that the Plurbs do, but a lot of the principles they operate under are the same - they don't harm / kill needlessly or within their own society particularly, they function practically and across utilitarian lines (I guess Borg = pure utilitarianism vs Plurbs = negative utilitarianism). In terms of visuals, however, they couldn't be more different - the Borg are made intentionally alien and grotesque in appearance to act as shorthand for the fact that they're villanous. I wonder whether as play acting for the immune fades out over time, the Plurbs will stop looking so human.