Not only WoW but ESO also has this feature where your AI companions can fill spots in dungeons.

Also WoW's upcoming Delve feature looks more like both Guild Wars 2's Fractals and our Variant dungeons but better. Especially since unlike Variant/Criterion, the partner NPC contributes in combat and you can outfit them with gear alongside earning endgame rewards. Only major difference is I think Delves are solo content only, but I really hope CBU3 arent just sitting in their laurels and are actually looking at their competition.

Theres a lot of improved ideas sitting at the table and they need to start putting a lot of FFXIV's content features to make bank for them