The D7500 is an example of scrambled bits from the current parts bins that fall a bit short of a truly new model.
I think they just didn't want it to compete with the D500 as a prosumer camera -- and I've been seeing lots of TV commercials for it, branding it like a normal cell phone camera -- taking quick snapshots while hanging out in the city with friends...
it does have impressive features with the improved AF module -- heck it even has AUTO AF-Fine Tuning. But the removal of the dual SD slot was just odd at best; you'd think with a camera that does 4k videos that you'd want extra room for storage.