The reason the Z1000 has no down blipper is because of the manual (cable operated) throttle instead of electronic. Downblipper requires ride-by-wire throttle so that the computer can open the throttle body to increase RPM's for downshift, with cable throttle it cannot do that. Same goes for traction control, the ignition system is too old to integrate. The electronics on the current Z1000 are still essentially the exact same as those on the 2010 model year bike, and without a modern ECU and electronic throttle, none of these features are possible.
I would imagine that at this year's EICMA we will see a new 2020 Z1000 as the current model is over 5 years old (10 years techincally because the 4th gen is same as 3rd gen), and I would find it hard to believe that it would use manual throttle still, even if it uses the same engine as before.