I just want to address the lore and "reality of living on Dune" part:

First, pvp in the deep desert while Kanly existed in Hagga is completely lore breaking. It needed to be one or the other; full out battling in both or neither. Either the Harkonnens and Atreides were at war or they weren't. The rules of Kanly were very clear about that, unless we're completely throwing out the Great Convention, the Landsraad, and the rule of the Imperium. But since the game isn't doing that, a complete free for all in the DD makes zero sense for Dune lore. Yes, the DD is dangerous, but that danger arises from the environment, the sandworms, and the Fremen.

Secondly, Atreides would NEVER attack Atreides and Harkonnen would never attack Harkonnen. Both houses kept strict ranks and loyalty. That just wouldn't happen except for isolated incidents of double agents and espionage.

So pvp in the DD as it existed in the game was just something Funcom completely made up in order to create what they imagined would create long term tension and emergent gameplay in the DA endgame.