I am finding the same, new fw releases (especially big ones like this) mean re-thinking button assignments.
For the past two decades I have been a BBAF believer; however, last year someone on this forum introduced me to a new way of shooting (or maybe an old way with a new twist) and that was using the shutter button to engage AF and take the shot but utilizing the back button for 3D handoff (what I'm calling BB3D). This has yielded a higher "keeper" rate for my style of shooting as I had not realized how "delayed" I could be in pressing BBAF to wake up AF, but my index finger is much quicker at being at the ready with half shutter presses. Anyway, Steve recommended Cycle AF to the the Video button (which I had not used yet (for custom control) but realized during still photography this button isn't used at all so it makes sense to take advantage of it); however, right now my center joystick (sub-selector) is set for Recall Shooting Function (RSF) Subject Detect (SD) On/Off toggle, but now with Cycle AF and how I am using BB3D it frees up my thumb a bit more and since I'm using the joystick for AF box position anyway I think it makes sense that I switch the behavior of center joystick with video button and allow my center joystick to be my cycle AF and the video button will now be my SD on/off toggle.
The beauty of these custom controls is we can each setup our cameras to meet our individual needs. At the end of the day it's about what is most intuitive for us, but what can work against us is building muscle memory for certain layouts and when a fw update comes and you decide to change your layout now you have to re-train that muscle memory.
Yes, I think this is one of the most highly sought after updates going through this thread.
I think we're all in the same boat
I agree, that is what impressed me with Nikon when I got my Z6, even after the Z6 II was released Nikon continued to do fw updates for the older Z6 which I greatly appreciated, in a world where many electronics companies are trying to force users to buy new equipment, it's refreshing that Nikon is still supporting older products. Hopefully this future proofs the Z8 for quite some time...