Though the terror missions are still there in XCOM 2. Regarding the overwatch turtling, another issue is the pod system, as the player will always meet a group

Though the terror missions are still there in XCOM 2. Regarding the overwatch turtling, another issue is the pod system, as the player will always meet a group of aliens, which, so activating a pod is more dangerous than just sighting an alien in the old game. But trying to play without the Overwatch crawl makes for an interesting challenge.