Shutter sound sync sucks spectacularly
A pointless rant, and an invitation to casual research...
In low light with flash suppressed, the shutter sound effect on my KEYone is generated an eternity before a blurry shot is actually captured as the phone is moved off-target. A fat smack in the head to the responsible parties. Too young to have owned a film camera I suppose.
Let me explain: when the noise stops, that should indicate completion of the photo-taking operation, not affirm the user's intention to take a photo sometime in the near future.
I don't have a dozen smartphones at hand to test my suspicion that this may be a common design oversight. I'd love it if owners of other phones would try this.
Just turn the flash off in a low light situation (not a dark closet, just a situation in which you'd normally expect the phone to use flash), compose a shot, hit the button and as soon as the shutter sound is generated, move the phone rapidly away. What did you get?