I love how this game has a real end game content
In EU4 or CK3, once you are big enough, the game stops being difficult. It can be tedious in EU, can be random roleplay in CK, but the content is what you choose to make it. In Vic3, the game forces you to play.
Of course if you start poorer, you can feel like the time frame is not enough. I spent a whole 100 years as Persia chaining traditionalists in command until 1925, and if I managed to grow economically, I could never reach the true potential of the nation. Or if you choose to stay small as Belgium you won't face much of it.
But if you start or become large, for example build a French Empire that rivals the British one, you will face real struggles. Large separatists revolts when they become educated enough, subjects start to have their own revolts and be less servile, workers will ask for rights, etc... To solve that you have several tools, you can choose oppression, maintain a costly military and make sure to always be on the right side of revolution, or build a utopia with large redistribution, welfare and multiculturalism. But there is agency, there is content, there is skill involved.