First, make no mistake, just because I understand doesn't mean I like the current state of the game more than anyone else does. People have been used with new versions needing a patch or two to fix issues but now it was worse than usual.
That being said, let's put ourselves in PDX's shoes. For 4 months they worked on the rework and associated DLC. This part cannot be rushed since you can't just tell a game studio "Make new content faster". It takes as long as it takes, and it took until holidays were near. Paradox could have waited until the holidays were over, but wanted us to have the game during holidays when most of us would be free. They released it two weeks before holidays so they would have time to patch as many bugs, performance issues and unbalances as possible. They knew it won't be enough, and I do not like the practice of rushing something before Christmas, but it was that or leave us with nothing until the holidays are over. Sometimes you have to make do with the current situation
That being said, let's put ourselves in PDX's shoes. For 4 months they worked on the rework and associated DLC. This part cannot be rushed since you can't just tell a game studio "Make new content faster". It takes as long as it takes, and it took until holidays were near. Paradox could have waited until the holidays were over, but wanted us to have the game during holidays when most of us would be free. They released it two weeks before holidays so they would have time to patch as many bugs, performance issues and unbalances as possible. They knew it won't be enough, and I do not like the practice of rushing something before Christmas, but it was that or leave us with nothing until the holidays are over. Sometimes you have to make do with the current situation