Lenses I wonder

Nikon's high-end lenses are not made continuously. A production line is set up, enough are made to cover expected sales for several years, then the production line switches to another lens. That, rather than the design process, sets a limit to how many new lenses can be introduced over a year, because each time the production line changes over, you lose production.

Also, obviously, a larger-volume lens occupies the production line for longer, so it is particularly difficult to introduce multiple larger-volume lenses over a short time. What we usually see is a mixture of low-volume and large-volume lenses.

The Z mount complicates the process, because Nikon needs to introduce several large-volume lenses over a relatively short period, so my guess, FWIW, is that it is unlikely we will see many new F mount lenses, and no larger-volume F mount lenses while that happens. It may not be accidental that the new 500/5.6 is a very low volume lens.