bclaff
Forum Pro
The D7100 was a failed experiment for Nikon, non-Sony sensor, Toshiba I think.The hope is that as times goes Nikon gets better and better at correcting these artifacts just like they did in the transition from the D7100 to the D7200 version of the same sensor, but the case of the phase detect rows in the Z bodies seems more complicated and improvements much slower.
The D7200 never had any issues; so there were none to be solved.