My only concern SEEMS to have been answered. Retainer Jobs appear to be straight upgrades to Retainer Classes, so you don't need a soulstone.
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Being forced to sociate with people isn't exactly fun for everyone. Time to yourself in a game you payed for is all you need to enjoy it sometimes. NPC companion system would help with that. its not breaking an MMO making it possible to run with an NPC in the overworld or dungeons. It's still a massive multiplayer online game. I see no one complaining about the solo'd instances in the story mode where you work with NPCs to do stuff. :/