Unfortunately, when you boil it all down, that is precisely what most of the complaints are about. Yes, people couch it in terms of "poor design decisions", "less fun", "limiting styles of play", etc. But then they turn right around and express a desire for game where they can conquer the world as an OPM.
Hey, I'm all in favor of letting them and think an occasional WC can be fun. But let's not kid ourselves, it's about difficulty levels. And if Paradox were to implement more difficulty options, including ones that allowed for easy conquests, most of these repetitive posts would stop. Reintroducing cheesy mechanics would work, too. Of course Paradox should never call it easy mode, since that might offend some people who really just want an alternative style, not an easier game. Maybe "sandbox" mode would suit?
Would that it were a strawman. And yes, modding and difficulty settings are easy solutions.