First time My friend and I went out shooting after he bought his new 850 he found himself stuck on the side of a mine dump struggling to find a setting he had used with his 810. What annoyed him is it turned out to be in the same place on the 850 as it was on the 810 but he had set that up so many years before he couldn’t remember where to find it. Something to do with bracketing. A setting I don’t use but it’s a part of how he likes to shoot. It never occurred to me to have a go on a public forum about how people are struggling with the 850 menus. His error, we laughed about it, he sorted it out and we all moved on
You just did though.

I would in fact agree that the Nikon menus could be improved as well. I hope that Nikon leverages the opportunity provided by their new mirrorless to improve things further.
Once users get used to a design (even if it is a bad one), there are always people internally and externally to defend the existing on the ground that people don't like changing.
A major paradigm shift such as the move to mirrorless is the opportunity to improve.
As a long term Nikon user, there many other things I think Nikon could/should improve:
- eye AF on the D850/D5 doesn't work that well,
- I have had cases of condensation in the viewfinder,
- the sharing of images to smart devices with snapbridge is far from optimal
- the thingy used to control the SB5000 wireless flash is an annoyance, this should be built-in
- the AF control switch is had to use without looking at it
- as already mentioned, the menus could be easier to navigate
- when having a strong light from below the camera, there are cases of shading with bright lenses (this can be annoying when shooting panos)
Cheers,
Bernard