Ah - looking back, I see I was conflating 'rational basis/deeply flawed' and 'more motivated by brand loyalty' to get 'no rational basis for popularity', so that was what I was responding to; my apologies.
That said, I certainly disagree with many of these points:
- Lack of tilting or swivelling rear screen.
I think I've said this before, but this is a minor thing at most to me. A tilt/swivel rear screen is a nice-to-have; but on the cameras I've owned with one over the last couple of decades, I think I've used one fewer than 20 times. Once a year is not something I'm going to miss, and in fact I don't miss it at all on the fp.
- Weird after-thought external EVF that prevents use of flash and has no auto switching from the rear screen.
Yes, the awkward EVF is the one serious flaw I have with the camera.
I honestly don't notice. I do have a couple of extra batteries; but I have had extra batteries for just about every camera I've owned in the last 10-15 years, including the S5. A battery on the fp lasts me 2-3 typical outings, and that's not much different than the S5.
- Only one top plate dial.
Another case of 'nice to have, not essential'. For my style of shooting, with manual lenses 80-90% of the time, I don't need a second dial; aperture goes on the lens, dial adjusts shutter or EV as desired.
- No mechanical shutter and slow sensor readout - meaning guaranteed banding in low light.
No, definitely not 'guaranteed'. The overwhelming majority of my indoor shooting has no banding; the only time I consistently get it is with DLP projected images.
That's a theoretical flaw, but in practice I almost never notice. I do put a 1/60 floor on shutter speed and let ISO float up to 6400; the fp's sensor handles high ISO very well.
As I said above, that's an
advantage, not a flaw. If you don't need a grip, you save space; if you do need one, there's at least 15-20 different ones to choose from, so you can customize it to your liking. The two I use most often are the OEM 'small' rubberized grip and a third-party wooden grip; I've thought about getting a second one and sanding it down for a custom grip. I've also tried one where the grip is a metallic box with multiple tripod sockets along each side, giving you a lot of flexibility for tripod shooting.
I’m sure in the right hands it can take beautiful photos; and its compactness is hard to argue with, but the above list really does impose a lot of limitations.
Most of those limitations aren't limiting for me at all. And aside from the rational advantages I noted above, it's a camera I really
enjoy shooting with. With the smaller lenses I prefer, I think it handles better than the S5; it fits my hand better, has a better movement arm, and is easier to hold for longer periods. I strongly prefer its simplified interface; the few controls I need are large and easy to operate, without extraneous buttons getting in the way. There's a reason I've used it for the overwhelming majority of my shooting in the years since I got it.