But this diminishes the overall quality of the game, you might think its great now but what about later? the Call of Duty series and Activision are great example how quality diminishes when it has little regard to it's hardcore gamers and opens it's doors to casual players thus reducing what once made it a great series/company, basically selling out.
I've got probably 10,000 hours (It's probably even more than that) combined in Paradox titles over, HOI, HOI 2, HOI 3, EU 2, EU 3, EU 4, Vicky 1, Vicky 2, Rome and CK2. I'm about as hardcore as you get and that extends beyond just paradox titles.
EU4 is the best EU in the series so far. It isn't perfect (nothing is) some of the decisions they've made are dumb (scaling truce timers) but this is just the typical "end of the world" mentality people have. The ship isn't sinking, Paradox haven't changed their values. Paradox is better than it has ever been. They've progressed from making purely aspergeresque games (which I love btw) to retaining that essential essence but streaming lining the UI and easing the accessibility of the title. More people than ever are playing them. They retain their fundamental depth.
I've been decrying the decline of PC gaming since the advent of the 3d graphics card where games have been reduced in complexity and have become formulaic in design. Where the selling point of the next big game has often been "per pixel shading bit mapping version who the hell cares". I've been raging against consolization of gaming in general. "Stream-lining" has become synonymous with dumbing down, removing depth and Electronic Arts in general. That isn't what EU4 represents. Making the UI more navigable isn't dumbing down, it is stream-lining as it should be. Making the game more playable without stripping it of its character.
Yes EU4 has some arbitrary design decisions. At the same time, EU4 has made some pretty big strides forward that people have been asking for, for over a decade. The normalization of unit stats (huge change)
EU4 is a great game. CK2 is arguably their best game. Victoria 2 might be even better than CK2, and the next stop is HOI. I personally can't wait to see the new iteration of HOI which is my personal favorite in the series and I've loved all 3 instances of it. Decline? Paradox is in their prime, better than ever.