When looking at front doors here in Florida, I look at the buildings penetrations from a distance and consider how well will the door stand up to and resist occasional hurricane force wind loads and the almost daily, wet seasonal wind driven rains.
Being in the alcove provides a great deal of protection as well as the hurricane rating of the doors. However; while many hurricane rated doors, including sliding glass doors, will stand up to wind driven loads and impacts, they have been shown to leak at the seals during wind driven rain events. Seals must be checked closely by the Inspector and the client needs to monitor these seals and the surrounding areas regularly for air and water leaks.
What considerations are specific to where you live?