Imperator has it's own gigantic problems, but it really is a testament to how fucked Paradox's issues are that once they realised Imperator was hemorrhaging cash that they fixed the damn thing overnight and made a decent game of it, then abandoned ship.
A bit conspiratorial, but I wouldn't be surprised if they actually sat down in executive management and hashed out that they were better off financially completing the game and making it fun for the player than simply abandoning the live service intended to be implemented and risk having a lawsuit or something equally damaging.
I remember thinking back in 2014 or whatever the fuck that EU4 was feature complete as sold, probably nowhere near as great as EU3 plus expansions, but it was a solid enough move for a company that straddles the line between casual and grognard strategy games. Now? Not so much. There's been so much strapped and taped to the underlying machine that by necessity do not interact with each other, to the point that it feels fundamentally broken despite being eight years old instead of one year old.
HoI4 has the same issue. Everything is created in a vacuum because someone might have No Step Back, but not Battle for the Bosporus, or Death or Dishonor but not Together for Victory. The only semi-constant is that La Resistance is expands a handful of Soviet focuses by giving an extra spy slot.
Stellaris gets remade every few years as they decide to strip features in favour of streamlining everything so that the twelve year olds who bought it on sale don't immediately refund their birthday cash because they don't understand basic mechanics.
Victoria III will be a shit show on launch. Don't worry, it'll be a huge success especially on Youtube, all the morons will buy it to create Communist America, but in terms of gameplay there are maybe three things to do. Diplomatic plays, micro trade, and press the colonise button when it isn't greyed out. Very fun.