That’s why I keep saying that PDS needs to leverage its save converter tools and allow us to play peacetime in Vicky 3 in the new Vicky 3. However, There needs to be something like World Tension that fluctuates throughout the campaign. Minor wars will still continue to be fought in Vicky 3, but when World Tension breaks a certain threshold, the concert of Europe breaks down and players that have bought an optional WWI DLC for HOI4(which I anticipate will eventually be released for HOI4 players) can load their Vicky 3 save into HOI4, and play the Great War out under modified HOI4 rules.
In my Humble Opinion this is the only way that Vicky 3 and HOI4 will ever be perfected. Vicky 3 will be able to set up an organic Great War played out under more in depth war rules, and the conclusion of this war will be the foundation of WWII, as it was in history.
Again, In My Humble Opinion, this will add a whole new importance to the Concert of Europe period from 1815-1914(though in true PDS spirit I don't believe WWI has to start in 1914 or has to start at all) as the Great Powers vie to improve their standing and strategic positions. At the same time, it will drastically improve HOI4 as the stereotypical Germany vs. the World shtick will be turned upside down, and we will see a new scenario for WW2 in almost every game we play. Perhaps the first world war is between the United States and Great Britain that starts over control of the Atlantic, or maybe France builds a coalition of revanche against Germany, with the niggle that Germany and Britain actually concluded an alliance in the early 1900's(which they very nearly did).
Both games would benefit from being linked to one another and PDS has the tools, Vicky, HOI and experience with converters, to do it.