I suspect Paradox rushed the release as they don't want to fund the project anymore.
I'm not sure if they wanted to fund it or not anymore, but I'm sure Paradox probably said, "This is the date you will release the game." So, then they got everything they could into the game and fixed as many bugs as possible, and then they released it. They can't say that that is what happened because they would be in trouble from Paradox.
There are obviously some things they knew weren't ready and in game like the majority of leaders and generals and their portraits. Loans are another thing they couldn't get in, but we know it was going to be because they said it would and there is a panel that details loans and interest but it an inactive part of the screens.
They've probably already been given the schedule on which they will release DLC, if any are released. Paradox is like the accountant in this scenario. "You make X money, release it here. If X profit is made, this DLC will be released. Otherwise, you start on another project that we will approve." Paradoxically (pardon the pun (and alliteration)), accountants usually don't even make these kinds of decisions, but it's easier and more understandable to just say the bean counters are making the decisions based on the revenue and profit.
PoN was started before Paradox acquired Aegod so we don't know if they were even truly "behind" it conceptually, since they already had a game that was popular for that period and even a 2nd version of it.
And that's more than I posted in a long time!
KurtC in the WITE PBEM module.