This does not seem to me to be an optimal setup. The mechanical fuel injection system can only be optimal over a very narrow range (if at all). A computer controlled common rail fuel injection system can be optimal over a wider range. This combined with the computer controlling both as a coordinated system, means overall less soot and particulate production, placing less demand on the DPF and better fuel economy.:2cents:
It’s an advantage for the future!
I would take anything without a computer dependency for fuel delivery over one with any day. When the system gets old and has problems you just remove it and keep going! With the computer you will be at the mercy of $$$ and depending on age parts availability no matter the make of the machine.