Doing a plain world conquest is already much harder than the equivalent in EU4. You have a century less to work with, and you don't have anything like absolutism to reduce the amount of wars. Is there a 10K blob in your way? That'll take more than a dozen wars to dismantle.



Next, getting 100% of culture/religion will be stymied by the mechanic where the last pop in a territory often won't convert/assimilate. I believe this is because it's trying to migrate somewhere, which can take a century for something with only +0.06 monthly progress. You can probably move some slaves in to make the province starve to speed that up, but doing that across a large number of provinces is going to be extremely painful.



Going for a 3 1's is probably possible, but it'll be even more painful, difficult, and annoying than it is in EU4.