Please stop trying to defend the indefensible. Its very obvious that the upper city was intended, starting from Larians own words from 2 months ago about exploring it, to the very questionable placement of NPCs and entrances in act 3, to the many leads into the upper city that remain in the game to, yes, datamined content that shows quest trigger for the upper city for quests that are quite clearly missing as it concerns companions.
I see. And do you have a source for these upper city quest triggers? Or should I just accept this on faith, like the above list?
If they're thinking about the same ones I am, someone posted them in the big Reddit comment thread on the Community Update. I think it was several lines that indicated there was an Upper City map distinct from Lower City and from the ending gauntlet 'Upper City.'