I hope you have heard of the PirahÃ£. They are this wonderful tribe in the Amazon who refuse to be civilized. Their language is odd, to the point where die-hard linguists come uncomfortably close to having to declare them inhuman because their theories are under threat. Its quite absurd to watch the squirming.
Anyhow, it seems to me that we have here a unique opportunity to study a people who have a different form of inter-P-world coupling. If we regard language as a means of structural coupling across P-worlds, they appear to have a weaker coupling, and thus, in a sense, live more within their individual P-worlds.
They do not live in a densely populated area. I suspect that urbanization and dense spatial packing of P-worlds led to a tightening of the coupling mechanisms between worlds. Our language is more probing, more demanding of a common understanding, and less tolerant of the idiosyncracy of the P-world.
I find the P-world/R-world distinction helps me to engage imaginatively with these sometime baffling issues. I hope others find likewise.