I have the shooting memory banks set up on the Z8 (as I did with the D500) so that B, C and D have different settings for different levels of action (slow, medium and fast) , e.g Memory bank D is set up to use a minimum shutter speed of 1/2500 sec and allow auto iso to be unrestricted (at the moment any way, I tend to switch things around)
Memory bank A is set up for full manual and I switch to bank A when I have a stationary subject or landscape where I have time to adjust all settings.knowing I can instantly turn back to memory bank B, C or D if I need to quickly switch back to an action subject..
The memory banks of course remember your last settings (unlike the custom memory settings) but I like this feature, as when I switch between memory banks I go back to the setting that suit the "conditions of the day".
So if it’s a very bright day and I'm trying to photograph small flying birds I may have upped the shutter speed for memory bank D, to 1/5000 sec. If I have then switched to take. a habitat shot (memory bank A) during a lull in bird activity, switching back to Memory bank D takes me back to where I had been 10 minute earlier, and not back to a generic "wildlife" custom set of settings.
The memory banks on the Z8/Z9 /D5/D6/D850/D500 can be a bit confusing at first, but I find them more useful than the custom options in he Z6/Z7/D750 etc . The best approach is from Olympus which combines the features of both approaches. I don't know why after all these years, and a lot of complaints from people who expect the memory banks to work like custom memory settings, Nikon haven't provided a combination option like the Olympus one.
Reikan Focal, offer an app(Ios and android) that allows you to store and restore memory bank settings
https://reikanfocal.com/snapshots.html. I have an old license for Reikan, so I plan to give this a look, but it isn't a priority.