Perhaps it's different elsewhere, but in the US, EU5 is $60 and Civ7 is $70. That's not half. And there absolutely is withheld content. There's already a season pass available that contains an instant unlock of building models, an immersion pack, and two "chronicle packs", whatever that is. Oh, and there's another unlock of building models if you sign up for their newsletter. And a pre-order bonus, which is the EU4 soundtrack for some reason.
It's not half, that's true. I paid $130 for the Founder's Edition, and if I could do it again, I'm not sure I would do it any differently because I really wanted to play during the advanced access window. At the same time, I can't say that it was a wise purchase, as I do think that the DLC that was included in the FE has been overpriced and disappointing.
When you look at the top line prices for both games: US $130 for the Founder's Edition compared to $85 for the top-of-the-line EU V variant with the DLC you listed, it's a difference of $45, which is not half, but it's not nothing either. The "chronicle" packs will interest players who enjoy playing the nations in the descriptions: Castile, Morocco, France, and Scotland (and their neighbors) -- but if you aren't interested in these nations, you may decide to skip these for now or to purchase them later when they go on sale. When I purchased Founder's, I didn't know what civilizations would be included, for example.
While I recognize that Paradox is (in)famous for their DLC model, it does seem (to me) that the base game and the "deluxe" version have been priced more fairly than Civ VII. The most common complaint about EU5 is that the game has been delivered with too many features that it's confusing and overwhelming for players. I don't think anyone can accuse Civ VII of the same.
Regardless, the player bases are different, so I am not sure what the long term effects will be. I'm sure Ed Beach will be very busy in his office starting Tuesday, November 4, as I suspect he is a big-time EU devotee.