That is exactly what happened here. At release, the devs clearly felt that the AI was alright, and whenever there's a forum post saying otherwise the devs would ask for a screenshot and save game about the issue, after many of these posts, the devs still asked for the same. Firstly, QC should have tested this and SEEN those problems, which weren't at all fringe cases before release, and secondly, after release, instead of admitting that the AI is broken, the devs hid behind this bearucratic wall. I think that most upsetting thing me and other players have with this game and the 'paradox model', is that day-one purchasers and preorderers are effectively beta-testers. And while it's true that talking about this won't help the situation much, I feel that if the devs/paradox executives came out and said something along the lines of 'We're sorry the product was so poor at launch, we pledge to solve all the significant problems within x months, and that as an apology for selling an unfinished game, we will give away x for free.' This will generate a lot of goodwill within the community and placate most of the playerbase. But instead of that, they're announcing two paid DLC's before the core game is even fixed, that's pretty much as big a slap in the face as you can get.
Yeah, much as I love Paradox games they really feel like they ought to be Early Access releases for the first year or so of their lifespan. People are usually far more tolerant of bugs and problems when there's proper acknowledgement that said issues exist and the dev team is working on them.
To be fair to Paradox, the ease of online patching and the DLC model has more and more companies going down the "Our players are beta testers" path. Paradox games are some of the only ones I consider buying at any time other than years after release when they're on sale.