Needs serious work done on it, one example is the Empire of Outremer.
A quick google search shows that for a lot of players, the decision to form the Outremer empire eluded them; and is much more difficult than in ck2. This is minor to those whose goal is not to form the Outremer, but obviously game breaking for those who do. The game needs serious serious work done when coming to the decisions, the option to form the Outremer should be there from the beginning, albeit inaccessible until the conditions are met. The game otherwise is masterfully created, however these sort of bugs do indeed exist. The decisions tab in my opinion, should reflect the different paths you could take so as to be suggestive.