At this point I feel like early DLC scope were much smaller and sparse in features than what we're seeing now. Just compare Royal Court to Roads to Power or the upcoming All Under Heaven.
Flavor Packs seems to be a relic of the past at this point, because I think they're going to use Core Expansions to cover a few regions at once, and by the looks of Khans of the Steppe, it looks like those early regions covered in FP like Iberia, Norse and Persia will end up feeling too light in content in comparison to other parts of the world when they receive their own flavor.
Events Pack I can't talk about, because F&F is the only one I have.
Sadly, besides balancing things (like when they fixed the situation where you were locked out of finishing Iberian Struggle), I doubt they're going to rework systems or add content. That's why I think the later your favorite regions get a DLC, the better. It always happens.
RtP is when they took off the kid's gloves, the scale and quality from that pack & this season pass are off the charts compared to everything that came before.
Why do people dislike the Iberian struggle so much?
Unrelated, are we ever getting love and lust?
I think the entire idea of struggles was terrible, as mentioned before, they are mechanica, arbitrary rules that throw away all of the game's sytems, claims, dejure lands, nothing has any meaning anymore, it's all about the current phase's mechanics, I think the game's better off without them and it just makes getting into those regions extremely annoying.
There's also the issue of reselling the same DLC twice, imagine of CK2 tried to sell Reaper's due in parts as well, with the european disease pack, then the steppe disease pack, then the north african disease pack, etc...
This is what it feels like to see 2+ DLCs dedicated to the same mechanic.
Not being a good mechanic makes it even worse.
Imagine if, instead of having these arbitrary rules, encased in certain regions, we had an actual mechanic creating a struggle between old rival kingdoms/empires in which they started competing in several areas, trying to get the most prestige, the most piety, the best economy, the biggest army, etc... And gaining advantages over the other side, without messing with the game's core systems like claims, dejure lands, etc.. Imagine if they could pop up anywhere after a period of hostility between empires, or even as a result from terrible culture acceptance from hostile actions between their main cultures. That would be far more interesting than these arbitrary rules and OP rewards IMO.