Legitimate concern based on the article:
The system could easily calculate the energy you are using, and determine the available capacity to keep on hand. So, say, keep a minimum of 25 miles of battery capacity, which could provide enough energy along with the ICE to climb any long grade in the US. That 25 miles of capacity could be 10kWh or it may be 50kWh, depending on the size of the load you are towing. (I'm throwing numbers around here as a concept, not actual values)
There could also be a way for the driver to select extra capacity if they want to keep some spare range on hand. For instance, if they are going to be boondocking in their RV and want the battery charged fully when they reach their destination so they can use the truck for power.
I'm hoping they make this a reality because this is exactly what I want in my next Super Duty!