- 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.
It wouldn't even really make sense, for example the Snowfall DLC only had permanently snowy maps, no snow was added to existing maps or maps from other DLC. CS2 will have dynamic seasons and climate. So asking for the Snowfall DLC in CS2 is asking for a feature regression.