And unless Nikon has actually applied a blackout crop on Z cameras when a DX lens is attached, I would never buy something with that specific intended use, I hated using DX lenses on my FX bodies, just one more thing to mentally check before pressing the shutter.
While you can have the Z bodies switch crop factors automatically (with all electronic lenses at least), I agree with the sentiment in the second sentence.
Interesting exchange to watch ... I for one love every bit of the benefits the Z 7 II offers over the Z 6. However, that doesn't take anything away from the merits of the Z 6 and Z 50 - both great bodies in their own right. In my experience, though, the Z 7 II takes everything the Z (FX) system stands for a tangible step further compared to the earlier bodies. It's not only about the resolution - even though for me, that was the decisive thing initially (or I could just have swapped the Z 6 for a Z 6 II). Yet the Z 7 II is just that crucial bit more fluid in all respects - while offering much higher resolution, it doesn't miss a beat.
I'm glad I kept the Z 6 around, though - it's my most used camera because I often simply don't need the extra horsepower of the Z 7 II. But if I do, it's great to have. And thanks to the technical improvements, it's no more of a hassle to use and shoot as a Z 6 would be - you can in fact treat it exactly the same, no need to worry about anything. For such a high resolution body, that's quite something ... I'm actually pretty sure that the Z 7 doesn't inspire quite the same amount of confidence, to be honest.
At the time being, I simply can't think of a camera to choose *over* the Z 7 II - it has so far prevented me successfully from looking into quite a few new arrivals or options (the M10-R, the M11, the Q2, even the A7R IV and SL2); at the same time, the Z 6 keeps on giving (even when compared to a S5 or A7 III; the A7 IV obviously beats it, but not in a way I find important enough). The Z 6 is now my "official" travel camera, too, because I've managed to put together a nice "minimal" setup as well, thanks to the arrival of the Z 40mm f/2 (and the addition of the Laowa 9mm f/5.6, but that's just my kind of spin ...).
As for the Z 50, well, it really depends what you compare it to; in my experience, it doesn't beat the Z 7 II by a long shot, in any shape or form, but I guess if you just mount a DX lens on the Z 7 (probably a tele, possibly a zoom), you're actually not going see any real benefits: The resolutions advantage is gone, and the Z 50 holds its own when it comes to AF. Nevertheless, the Z 7 has good I.B.I.S., a way bigger battery, better weather sealing ... It's bigger and heavier, though, and often, all you need is the Z 50 with a handy zoom (I'm referring to both the Z 16-50mm pancake and the Z 18-140mm; the latter has grown on me considerably). So, yes, the Z 7 may indeed be overkill or even unsatisfactory when compared to the Z 50 *on those terms*.
What I love to do: I mount the 70-300mm f/4.5-5.6E AF-P on the Z 50 via the FTZ adapter and get a nice additional gain in reach - withour fiddling with my settings. That combo is a lot of fun to use and works a treat. When I mount the Z 24-200mm on the Z 6, I can cover everything from 24mm to 450mm(-e) with two handy combos that remain portable (I have that setup ready for tomorrow - it all fits in a small backpack, alongside everything else I need for a day out).
So, from that perspective, a Z 5/Z 50 combo makes a lot of sense to me, a lot more than a single Z 7 to replace both of them. And that has a lot to do with the fact of there being
two of them ... at least in my book.
But as you say, @AndyH55, to each their own.
M.