I've had my Z6 for a couple of months now, and I have to say that I've been suitably impressed. However, the more I shot with it, the more I couldn't believe that Nikon didn't produce a 70-200 f/4 as one of the initial release lenses. The 24-70 is an excellent lens, and something in the lower 20s was often the widest many photographers used back in the day. The 24-70 covers that, but the Z really needs the longer lens, too. The original set, IMHO, should have been the 24-70 and an f/4 70-200, skipping the short zoom and the 50 if they had to skip something. The two f/4 zooms (24-70 and 70-200) more or less constitute a "kit" that would cover most things for most shooters. I specify f/4 because they can be relatively compact, and one of the raisons d' etre of mirrorless is compactness. Now I find that the next Z 70-200 will be an f/2.8, which almost certainly won't be very compact, and there really isn't an f/4 on the map. I think Nikon has taken a wrong turn here.
I've suggested what the first two lenses should have been, and I think the third lens should have been the 85 which apparently is still months away -- and I wouldn't be surprised if it's well into 2020 before we can get our hands on one here in the states; and the same for the f/2.8 70-200. In fact, I think those three lenses (24-70, 70-200, 85) should have come out with the initial body release. I find it odd that months after the initial release, the longest native lens for the Z is a 70...
I have an F-mount f2/8 70-200 that I use with my D800, and I have the adapter (which I've only really used with the 85G I use on my D800) but the combo of the adapter and the older f2/8 make a really awkward combo with the Z, with the lens and adapter bigger than the camera.
I do like the Z, but when I'm heading out, I now find that I'm picking up my older M4/3 bag more often than the Z. I've got a full range of lenses in m4/3, including 2 f/0.95s when I want them. It would be nice if I could say that about the Z, but according to the Z rumor sites, that won't be at least for two or three years or even longer before we have even a basic set of native lenses.