Personally, I like the grip for easy move to vertical aspect and I have grips on my D850, D800 and D500. My understanding is the reason Nikon built the grip in to the body was for heat dissipation. They were going for state of the art video as well as still performance (no blackout, 30fps FX jpg, 60fps DX jpg, 120fps DX jpg at 11mp), which required both a sensor that generated a lot of heat, but the new Xpeed 7 processor, which also generates a lot of heat. Other cameras have overheated, especially shooting video, and have been retrofitted with fans.