For me, backward compatibility with my existing gear is essential.
When deciding between the Zfc and Z50, I opted for the Zfc because it has the Non-CPU-lens Menu, which the Z50 is lacking. And I have a real bunch of non-CPU lenses...
Appearance is the thing I care less: if a camera looks like a turd but takes good pics, I'm in all the time!
I don't care about value over time, but then I seldom sell the stuff I buy. On the contrary, I tend to buy stuff that people are dumping. I dindn't buy into the Nikon Series 1 when it came out (2010-11), I started buying in 2020 when people (in COVID lockdown time) had time to look in their drawers for stuff to get rid of, and I got some pretty good bargains, some stuff barely ever used (Nikon 1AW1: 250 pics shuttercount, 150US$ with its two AW lenses! -and boxes-).
Image quality: depends on what you're doing, sometimes you can get away with a 6MP sensor, sometimes you need more resolution. The same goes for shooting bursts: if you take single shots, reframing carefully every time, you don't need 14fps, and vice versa.
Ciao from Massimo