These modern Pro cameras are indeed rather complex instruments, but Nikon's are at least manageable provided one invests in some reading and tests the new camera oneself. I for one find the menus (mostly) logical. My history with Nikon goes back to years of relying on BBAF, and I've no need to change this in the Z9. My primary custom setup consolidated with the D500 in 2016, and key principles still apply today. Back then I switched rather soon to leveraging the advantages of the AFmode+AFOn Custom setting option - so 3 complementary AFmodes on 3 buttons, including BBAF. If memory serves, I'm another who also benefited from Steve's earlier learning materials, including his first ebooks. And I also bought Thom Hogan's D850 guide.
Basically this is the HandOver (or Hybrid Focus) AF technique as it's come to be widely called over the past year. I found this setup and its modus operandi seamless in adding a D850, and eventually a D5 (with RSF!). The Handover technique is what
Thom Hogan describes as 'focus decision making on demand' with customized Fn buttons.
The absence of HandOver AF is the main reason why I found the Z7 and D780 underwhelming for how I photograph wildlife, even though these are both excellent cameras in other genres.
[As an aside, I experimented with dual shutter focus release some months ago with my Z9 on FW 3.0. One reason was curiosity and another was to try and replicate a proclaimed Z9 Bug, long story short.... I found I'm yet another who prefers BBAF.... But call me old fashioned! ]
In retrospect, I took to the Z9 like the pig to the proverbial. This camera gives HandOver AF a major boost with much improved customization scope + the positives of high frame rates, wysiwyg EVF, Silent-Shooting etc. Non Blackout is a Big Plus! If one has a Z7 / Z6, then you are likely to find these Mirrorless features will be similar yet significantly improved. What takes more time is drilling into the depth and breadth of the Menus to fine tune the camera. This is where the authoritative guidebooks are essential - together with the Custom Options table, which is worth printing out and carrying with you on trips.
(
There should be a Z8 dedicated equivalent, but I haven't searched the w-ww.)
Mid 2022, after 3+ months using a Z9 daily, it's been interesting to add a D6, which also has Custom Group Area modes (it inaugurated this feature in 2020) the best touch menu options etc and not least greatly underappreciated subject and eye detection, which works very reliably on many wild species. Overall, the biggest change has been learning the scope of the 3D Tracking mode with S-R. So IME despite the well know differences, I have found the D6 and Z9 have proved far more similar to use in practice, contrary to what many seem to believe. One reason is I use several of my F-mount Nikkors across both the Z9 and DSLRs.
The difference I see from a year+ of almost daily experience with the Z9's is how they allow many more options to leverage the AF and other features. I've found the Z8 is very similar, including how it allows using a full house of camera settings with one's Right hand only. The powerful sticky Subject Recognition gives considerable potential and scope; equally the Custom group Area modes (as with the D6) provide much leverage to wildlife photography. My primary modus operandi with a Pro Nikon ILC is to customize as many key functions to
operate with the Right hand only - as feasible. Compared to the cameras launched 10-6 years ago, the D6 and now Z9 and Z8 have refined these options for righthand usage.
Basically this is ye good olde BBAF custom setup with big benefits of options for extra quick switches between camera settings. Although I have only tested out a Z8, I set it up very similarly (obviously catering for the different button layout). I only shoot in Manual with (usually) Auto ISO, sometimes fully manual ISO in trickier light. Since my Z9 arrived early March 2022, I've used HE* RAW for wildlife and Lossless compressed for landscapes and macro. Near line settings are in the i-Menu (focus-shift, PreRelease Burst, Delay Exposure, Shooting Banks). All the other menu settings I often need are in MyMenu, set to Fn4.
My primary Z9 custom settings include assigning the Red Record Button to scroll Focus settings;
Leveraging the AFmode+AFOn option.... Fn1 = 3D; Fn2 = "single-point" Custom Group Area (CA1 1*1)and a larger narrow rectangle as CA2;
Lens Fn was set to AutoAF+AFOn but I now use the Len Fn1 and Fn2 to Recall a preset focus position (the on-Lens controls are setup differently on Z vs F Nikkors);
Depending on the subject and challenges, sometimes I have 3D or AutoAF on BBAF so change the Fn button accordingly....
These days I use the Display button for AutoAF+AFOn (this works like a 2nd BBAF),
Fn3 to Recall Shooting Functions (Hold ie toggle) recalls settings for Action - notably faster shutterspeed & highest framerate.
It was set to switch Animal Recognition on\off in 3D tracking mode, but since the recent Firmware updates, I found I rarely needed to turn this off with Handover AF using Custom Group Area <> 3D / AUTOAF. Fn3 is accessible when the camera is in either orientation (so this would be Fn2 in the Z8)