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It is all just power moving around. If you have a little tiny ICE generator running all the time you could draw 1/4 power from the generator and 3/4 power from the batteries. In other words the generator power could go right to the eMotor. You don't have to charge one side of the batteries and draw from the other.
The problem is the marketing angle of saying it is a "REEV". If you expect people to think of it as a 40 mile range EV with an "emergency range extender" never to be used except when you accidentally run the batteries down that is one thing. But I think in the real world you would prefer to have the ICE running sooner to keep the pack from getting all the way run down so frequently.
If you start up the ICE earlier and more frequently people may be more inclined to call it a hybrid instead of an EV with range extender. Marketing and engineering need to work together to work out all the details.
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