While I mostly agree, it's worth pointing out that EU 4 and Civ 6 share the problem of obfuscating or misrepresenting game rules. No matter how complex a game is, the answer to the question about a specific rule in a specific context should be available.
EU 4 has a non-trivial number of cases where the
UI lies to the player outright:
Only fort is capital fort.
True, albeit this is the least of one's concern when trying to learn EU4. I don't think UI lies are what makes up most of EU4's difficulty.
These are not acceptable practices and the "difficulty" associated with them is fake. Note that EU 4 devs have ignored multiple proven UI lies that could have been fixed with text editing (IE no mechanic change whatsoever) for years, despite their accurate documentation in bug reports. Civ 6 is marginally better with UI.
I agree, but as I said, it's not what actually makes EU4 difficult to learn. It makes it comparatively harder, but it's not the primary catalyst.
Even ignoring obvious bugs/lies, large numbers of unnecessary inputs and poor documentation of rules in-game lead to undue effort to learn Civ 6 and EU 4 alike. I'm calling this for what it is: shoddy. Not quite as disrespectful to customers as EA (provably and proven!) lying to consumers about player attributes in Madden, but still a bad showing for professional development teams. It's not like good UI is a lost art. Some AAA genres and the indy scene still know how. But not TBS/grand strategy apparently.
Even with a good and explanatory UI, EU4 would still be a very demanding game in terms of the volume of things needed to be learned. What bad UI does is obscure newcomers and make the initial steps of the learning curve steeper. Even for people who get used to the UI, the complications of the rules and mechanics make it hard to master even with hundred of hours into the game.
That being said, Paradox has a certain ineptitude at making things intuitive. For people who are old enough to have played the older EU games as well, what makes EU4 "easier" on the surface is really just an overall improvement in UI and more manageable general rules. EU4 and CK2 essentially took a step into the "uncanny valley" between bad and good UI design, so they both kind of repelled a lot of their elitist older fans and still make it hard on the newer fans. Still, it's comprehensible enough to have resulted in a meteoric rise in popularity, so they just copied the EU4 design philosophy everywhere instead of evolving it and making it better.
On the other hand, if you join a game hosted in EU 4, you can play with the host's DLC. Try this in Civ and see what happens. Civ 6 is a lot closer to pay to win in this regard...some people have access to civs that others don't outright. In EU 4 this is impossible.
Literally the only thing EU4 has going for it in terms of DLC. Everything else is completely and utterly crap. Overpriced, too little content, often unjustified when most of the changes come in the free patches etc. Especially the "content packs" and the recent trend of "immersion packs" is truly the apogee of Paradox's abysmal DLC policy. This is why when people accuse Firaxis of being too scummy with their DLCs my first instinct is to sarcastically smirk.
I disagree that the 2 are so different that they can't be compared. They are both grand strategy games that share some 4x aspects. Sure there are differences in their approach and focus but they are not so completely different that they can't be in the same genre and therefore comparable.
Grand strategy and 4X are not terms to be interpreted at face value. "Grand strategy" doesn't just mean "it's a strategy game and it'd grand in scope" and "4X" doesn't just include every game that qualifies for the name (explore, exploit, exterminate, expand). The genres since their start developed characteristics very particular to them which make them distinct and thus not interchangeable. You could never mistake a game like EU4 or CK2 for Civ VI or Endless Legend, for example, much like you wouldn't confuse Civ VI with Age of Empires, even though it's still a strategy game where you "explore, exploit, exterminate and expand".
It's sort of like the case with Skyrim: It's first person and you can technically shoot people with arrows and spells, but you wouldn't call it a "first person shooter".