This is a good post, Jonathan. I hope you didn't get bashed on DPReview for it.* I posted this on DPReview (with some additions), but I'll post it here as well!
I've been using mirrorless for 8 years and honestly all first generation mirrorless cameras lacked in some way when first introduced. Putting the hype aside, the Nikon Z cameras in comparison are very good for Nikon's first FF mirrorless effort. The Z bodies are not perfect and Nikon kind of screwed up the marketing blitz, but honestly looking at the cameras subjectively, they're very solid with potential firmware improvements and Nikon can easily make mid-cycle hardware revisions.
Nikon has done buffer upgrades in the past to cameras like the D1X and D3 and they've added a second card slot to the D300S when they implemented video. Also the tried-and-true mantra of avoiding 1st generation "anything" should always be followed! The best thing to do is flood Nikon Japan's email inbox directly and demand the features you want. If they didn't take mirrorless seriously, they wouldn't have made this camera to begin with.
Nikon got a lot right out the box in regards to 5-axis IBIS, image quality, high ISO, Nikon metering, ergonomics, build quality, touch screen, flash compatibility, weather sealed F-mount adapter, etc. People forget Sony launched the original Sony A7 with a freaking plastic mount, sensor reflections, undersized battery, terrible low light performance and a rear screen that would peel after prolonged use! Compared to the Olympus E-M1 that was released around the same time, (besides sensor) the E-M1 outclassed the A7 in every metric!
Looking at it holistically, the Z mount has very good future potential and now that the physical framework has been established, Nikon can put more resources into improving the firmware/software side. I think Nikon's main objective here was to stop the hemorrhaging of mirrorless switchers, establish a solid base to build off and give Nikon access to go fully digital moving forward. I'll probably avoid the first bodies and take a wait and see approach, but for the most part I think Nikon is on-track to build a solid system!