Are you saying we can't know whether we're united as people because we'd be using language which oversimplifies everything? I'd take a pragmatic view of communication.

https://medium.com/original-philosophy/how-understanding-the-facts-makes-all-knowledge-partly-subjective-bda98e29f990?sk=387e9e50b01927fbaae66014e5ed731a

https://medium.com/grim-tidings/is-a-worldview-just-a-weapon-we-wield-in-power-struggles-ffdb3c610d84?sk=f1a0de4410e37a5965fe568ee08b30f9