I don't call while scouting but will use a locator call to get them to gobble. However I can see the benefit of calling and observing their reaction too. It would tell you if a specific call, sound, or rhythm is effective or not to that group of turkeys.

I've been fortunate to hunt areas that all the turkeys respond to my calling but have heard of areas that have a lot of call shy birds. Those are the areas I could see calling during early scouting to form a "calling game plan".