almost every one of these is sort of set dressing and skin deep, and changed drastically in some fundamental way.

I think we’re on the same team here, but it would be silly not to view Dune as one inspiration among many. I think Herbert was a being a needlessly salty MFer though. For the second point, I was thinking more the Bene Gesserit than the Fremen, and while “warriors” is maybe stretching things a bit, you wouldn’t want to get on the bad side of a reverend mother.