only 1 "mode" has ai and it's not that popular and not lucrative to do. it is at the bottom of "things that progress your character". it is more or less a learning or soloing mode. besides, wow is still probably one of the most played games, especially mmos. there are open groups to run with actual people all the time, in all kinds of content.  plenty of games have done "ai" companion shit, and it always feels janky, or makes the game seem more dead. everquest for example has basically a requirement to play with companion ai, and has had it for like a decade
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