There are victory conditions, too. What is the point of the victory conditions if only the human player tries to achieve them?
I get the point about meta-gaming and immersion. The AI shouldn't gang up on the human player, shouldn't always backstab, especially if friendly relations benefits that AI, too, etc. But it also shouldn't passively and incompetently sit there pursuing no victory-oriented strategy at all (scientific, cultural, whatever, it doesn't have to be war). If that's the sort of game Firaxis is putting out, then they should go full Paradox and remove the victory conditions all together.
Personally, I want to play Civ specifically because it is a game. It's a crappy simulator of history, but it can be (and has been in past versions) a fun history-flavoured game.