None of Paradox' games are turn based, they're real time (but pausable). Their own description for the genre is "grand strategy", which is IMO between what is classically understood as "RTS" and "4X".
Well, technically speaking all those grand stategy games by paradox have turns - one month in EU4. Every player queues up actions in between turns, but they are doing it at the same time. IMO if we're being pedantic it's neither and is something in between skewed towards turn-based.
It's nothing like "pure" RTS like starcraft where everything is actually real time. Their 4X games have: speed control, pause, turns (days and months, depending on a game and action). If you remove ability make turns simulatinusly and make a single turn into a day - not much will change in gameplay other than it will take longer.
You don't 'queue up' actions in EU4 or any other Paradox grand strategy - you indicate something has to happen (start building something or move a formation somewhere) and it start happening immediately, in real time. The day/month/year doesn't serve any practical purpose outside of orientation for the end user. Nothing happens at the end of the day/month/year except for actions initiated earlier who's end happens to coincide.
Classically understood in video gaming context, the terms "RTS" and "4X" are pretty much mutually exclusive, even though some 4X titles are real-time, as you've noted.
That wasn't my understanding, and Wikipedia disagrees with you:
> 4X (abbreviation of Explore, Expand, Exploit, Exterminate) is a subgenre of strategy-based computer and board games, and include both turn-based and real-time strategy titles.
It's nothing like "pure" RTS like starcraft where everything is actually real time. Their 4X games have: speed control, pause, turns (days and months, depending on a game and action). If you remove ability make turns simulatinusly and make a single turn into a day - not much will change in gameplay other than it will take longer.