Oh, heavens no. If you actually want advocacy of CK3 over CK2, you'd be better off going to the main Reddit.
Your assumption isn't unreasonable, but not how it panned out over the years. The CK2 sub-forums are dead, so the players who prefer CK2 have simply migrated to the CK3 forum. Several of the CK3 forum's more prominent posters are CK2-over-CK3 types who never post in the CK2 forums to talk about CK2. Similar dynamic for those who have been saying that CK3 is fundamentally broken / loss the faith / no fun for literal years now, but are still posting. The CK3 paradox forum is where they hang out.
By extension / forum evolution over time, the CK3 forum is not where the 'we enjoy CK3 over CK2' types tend to gather, since they'd be in constant fights / downvotes / counterarguments against the CK2 forum refugees and the CK3-is-terrible-and-I'm-still-here-to-talk-about-it types. The Paradox CK3 forum is probably the worst 'CK3 space' for an argument that CK2 is *not* the preferrable thing.
That's a neat theory, but it's false.
The steam forums are the exact same, there are a handful, perhaps less than a dozen people spamming every single thread bringing up any flaws in CK3 versus hundreds/thousands of posters that don't stay forever and voice their concerns over the years, ever since launch, it's the exact same dozen people (except the paradox knight, yes, that was his username, he suddenly freaked out one day made one thread saying he couldn't stomach defending the game anymore, after years, and left to never be seen in CK3 communities again, he even had guides trying to teach people how to have fun in a game without challenge), I could name them all if you'd like, but I'm not sure if moderators would appreciate it, it's not hard to find them all in every single thread discussing this subject on steam.
Of course, many of them end up getting banned for one reason or another, most don't bother coming back, I know of 2 friends that don't really participate in these discussions and don't know their history like me, and probably you too, they got banned and they decided to never talk about CK2 or CK3 online again, but they constantly complain about the same things I do to me when the subject is brought up.
This forum in which all the big fans of paradox gather are as you say, meaning, the fans that know the most about these games, including CK3.
And even reddit, which, as a social media is known to have the lowest kind of people in the planet, and it's set up to not allow dissent anywhere by design is surprisingly changing, after all, what matters over there is not what you say it, but how you say it, you can make 2 identical posts about the same subject in the same community a month apart, changing your wording and one will get upvoted like crazy while the other will be downvoted into oblivion.
And even in that enviroment, people can't disagree with the exact same flaws pointed out by all the posters from this forum.
Here's an example of when I bothered participating in a discussion trying to mock (so it couldn't be a more hostile place for this) the people tired of having no game to play in the game:
Granted, this is reddit, so that +508 isn't just 508 people and there are surely drones, from tha thread mass downvoting that comment for no reason other than "I don't like the truth", so the actual number of people agreeing just in that discussion could be in the thousands, far from such a "vocal minority" and this is the most hostile community in the internet.
Of course, this kind of goes off-topic, but it would be odd to leave that off-topic comment there as if it was true.
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