That Celestrians are constrained by strict rules makes perfect sense. Angels are considered beings without free will, after all. And so such rules would constrain the angels of the Dragon Quest IX world.
As such, it makes good sense that Corvus the famed and captive Celestrian (who was finally revealed to be the game's big bad) couldn't be attacked when faced in battle because of his senior rank. And after I'd spent a good twenty minutes walking around with the Goddess Ring equipped to refill everyone's MP.
The Oubliette beneath Gittingham Palace was enemy ridden enough to make up for the lack of a boss battle. It's narrow twisting halls also made it difficult (but not impossible) to avoid fights. But I can't see the newly renovated Realm of the Mighty being bigger than the Oubliette. Unless in his ascending to this game's high heaven, Corvus radically redesigned the Realm of the Almighty.
Finally standing at the precipice of Dragon Quest IX's end I am faced with a question. It's the same question that faces any gamer at the end of an RPG. Should I barrel onward or take a step back and do some quests and such to (eventually) get the game's best equipment?
This game's definitely reminded me of Radiant Historia with its limited (though well-composed) music. Maybe its final boss will be just as much of a pushover.