This is a an unrealistic thing to expect or ask for. The new game uses a different art style, significantly alters the mechanics and uses the latest version of Unity, as opposed to Unity 5 from 2015. If they included every single DLC, they'd have to:

- Recreate or significantly update all of the assets they've created over the past 8 years. This would be a huge amount of work.

- Not alter any game mechanics, because otherwise the content from the DLC wouldn't work. OR alternatively re-design a dozen expansion packs at the same time for the new game. If they couldn't change the game in any way, why would they make a sequel?

They'll certainly include mechanics that they previously added in expansion packs and updates, but expecting them to just bundle all of the stuff from the expansions doesn't make sense from game design or business point of view.