Hi!
Just happened to stumble across your thread.
What do you find lacking with the Z50?
I think if you put it out in words, you can see more clearly whether it's GAS or really something essential for improving your photography!
These are the issues:
On the one hand you can clearly see that the Nikon strategy going forward is mainly fullframe focused with lots of very expensive, high quality lenses and no real premium APS-C lenses. So either you can get older lenses with an adapter, lower quality glass like the compact primes or the 2 kit lenses, or the more expensive S line lenses designed for fullframe.
On the other hand the body doesn't have IBIS, which combined with non stabilized lenses does hamper my ability to shoot in lower shutter speeds / lower ISO. The Z50 is also just a tad short, even with an L bracket, my pinky doesn't sit very comfortably on the camera. Furthermore the autofocus on the Z50 in my experience has been kind of a let down. Since the Z50 doesn't have the Wide area with eye AF. It isn't uncommon for my Z50 to want to focus on the forehead of someone, especially my baby who tends to shift quite a bit. The Z50 just can't keep up. Something like a Sony A6400 would do a much better job I think.
I've contemplated switching to something like A G9, which has the best ergonomics I've tried out. But is a m43 sensor, which hampers people photography to a certain extent.
Switching to something like a X-H1, again a nice big camera with more dedicated lenses but I would lose quite a bit of money on this exchange and the autofocus on the camera from what I gathered also isn't the greatest.
I have taken some great pictures in my opinion with the Z50 and the picture quality I feel is actually quite good for landscapes and portrait work (as long as people sit reasonably still. But its in situations with more movement and or in lower light where the camera just kind of disappoints in my opinion.
To combat this I will most likely just stick to lower aperture stabilized lenses as much as possible like the Sigma 17-70 or the stabilized f4 zoom lenses.