Yes - I will be underutilizing the chip. It would be nice to use the internal Flash program memory but it would require a modification to the PCB on which the mcu will live - memory map issues. I am switching from another microcontroller that did not have internal Flash, so I was using external EEPROM for the program space (and nothing for non-volatile memory). It would be more cost-effective to continue using the same external EEPROM.
I guess there's no way to do what I want with the EEPROM (dual-wield it, so to speak). Would be nice if I could just justify using the internal Flash and deprecate the external EEPROM altogether.