Theres plenty of situations where this doesn't work. If you're called from a business central line and you don't know their extension you just call back and get the normal call tree which can take you forever to get through. Or if you're on the "cancellation list" for an appointment if they can't get through to you, they don't wait for you to call back, they just go on to the next person to schedule in their open slot.
Taxi cab dispatchers will do this for sure. They do callbacks to “confirm” your ride, especially when busy, because if you don’t answer, they simply drop your request on the sticky office floor.
this is a loss of business for them, not my problem. it is 2025, if they do not have map where i can track where they are etc.. imma not going to be using that service...