Another thought. A little to the side, or maybe more on the edge, of our current discussion. I'll throw it in anyway, for what it's worth.
We talk about lifetime cameras. How long is the average life span? I believe it's 70 years - there score and then, the Bible said. Ifso, I'm over the limit by eight years and three months. Still kicking, still fit, still taking cameras out when I travel or go for an exercise walk in my home town or a weekend bush walk. And still enjoy a glass or two of good Victorian (Australia) red wine.
Moving on now. Shat is a lifetime for a camera? Until it breaks down? If can be repaired, it's back in the works after a break. Or until film ceases to be manufactured for it? Think 116, 616, 122, 620, 127, Bantam, Instamatic.
More to the basic point, a better question, may be - if you had to part company with all your cameras excepting only one, then which would that 'one' be?
Opening up an entirely new Pandora's box here...
In my case, I would want to make it two. One for film, one digital.
Film-wise, I would go with my Leica iif. The most basic kit I own, also one of the best. Used with a Weston EuroMaster which still gives exact exposure data, it would keep me happy for the rest of my life, if I overlook time spent processing films, and of course the scanning, but I would be photographing less quantity and more quality. So for me, a win-win new balance.
I also have two Nikkormat FT2s kit. And two F65s, with AA battery packs, which take the D lenses I use with my digital Nikons. Would I want to part with those? Well, if I had to. Reluctantly.
For digital it gets more complicated. I'm a Nikon photographer, have been since the 1980s, in D since 2009 when I decided the then new Nikon D90 gave me enough digital quality to make me want to move into this new medium. In quick succession I moved up to D700s (2012), D800s (2017 and 2019) and now,mirrorless Zs (2025).
To sum all this up, I'm as happy as, well, a clam in chowder with all my gear. Unlikely to want to ever change or part with them, especially my Z5 which I adore.
So one camera digital, which one? I would have to resist a regularly recurring urge to dump Nikon and buy a Leica Q3. A new can of worms here, obviously. An expensive one, but economising in other lenses and/or accessories, so a balance, sort of.
In photography as in everything else in life, nothing is really simple. Nor does it have to be too complicated. To resolve my problems, I would just make a spot decision and go with that, damn the consequences.