...HOI3 is playable using one of the few better mods but the core game has many issues. If they don't fix em in HOI4 I don't think you will have much fun, simple or not.
This is a great example of just what I'm talking about. HOI3 has issues. I'm sure it does but they're not issues that I've ever noticed and I've been playing the thing for the better part of 3 years now. The issues that it has are issues that only the truly dedicated will notice.
Those of us playing just for fun - well - I can only speak for myself and for me - I'm well past my dedicated/super grognard days. I'm in it for the fun of it and worrying about the details these days just isn't any fun (and I imagine that Paradox' marketing department has a bunch of research that would support that position or they wouldn't be going down the path they've chosen).