I am thinking Nikon's QC is not what it was on the newest Z stuff. My 70-200's tripod mount got loose on a shoot this week. I had only used it a few times. Lens was wiggling around, very disconcerting...4 little screws hold it on. Does not seem solid like the F versions were. The plastic plug popped off of the know too :<
On my new grip, the little battery door keeps popping off and it's hard to reattach , seems less well made too, kind of the cheaper feel of the Chinese knock-off versions of previous grips I have seen, I'm worrying this could be the future as Nikon is moving all of it's production offshore.
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As far as lenses I like the feel of the Z lenses better than any of the lower end F mount lenses I used.
I'm in no rush to buy cameras, I'll stick with my D7000 for now. I'll see what Nikon has in store and if I like it I'll get it.
It tends to be the little things, like the OP mentioned, lens hoods not attaching well, lens foots not staying attached properly (500 PF), and my own experience is that battery grips aren't as well made and constantly have connection issues. The D750 with grip was terrible, it was always draining, and the green light on the body was constantly flickering (yes it was a Nikon grip). Lets not even start on all the recalls on the D750, I think there were at least three. D800 focus issue (early production). The D600 fiasco is also a memory that stands out. SB-900 overheating issue. Nikon has had a somewhat spotty record in the last 5-10 years.
I really don't know what the long term implications are for the photography division, but I guess "real" Olympus is the medical imaging division.
I actually think M4/3 isn't really viable anymore as Panasonic kind of went full frame. With Olympus gone, there might be very little new development on M4/3.