I'm a firm believer that the transition to mirrorless needs a new mount. I get that pros want to re-use old lenses, but lenses can be sold.
So the new Nikon Z-series mirrorless cameras have a 'Z' mount and the FTZ mount adaptor lets you use F-mount lenses on a Z-mount camera.
> I get that pros want to re-use old lenses
I haven't yet had to buy a new lens to use my Z-series mirrorless, and probably wont while I'm still using it in conjunction with my F-mount D850