The point of my original post was straightforward - I was stating that I believe it will become possible within a few years (based on what has been published by dpr, fstoppers etc) for small format cameras such as M43 to use similar technology to that found in smartphones, to merge a burst of images in order to reduce noise.
What I stated, precisely was" if a camera could shoot half a dozen frames at 100fps there would be virtually no subject or camera movement between shots, and this is where in-camera merging will become a major feature for eliminating noise, merging focus-brackets, and hand-held pixel-shift high resolution".
I made no mention in that post of the individual or total exposure times, but you singled out one possible method of merging, that *won't* reduce noise, but ignored another possible method that *will* reduce noise.
You appear to believe (incorrectly) that I was talking *specifically* about the first method described by neuro i.e. "Merging ten exposures of 1/10 s into a single exposure of 1 s will not yield lower noise than a single 1 s exposure". That method clearly won't reduce noise!
The maths in my quickly written follow-up post was dodgy, but my original point remains. It *is* possible to reduce noise by merging a burst of images.
@neuroanatomist pointed out the method that would need to be used is that in his second example, i.e. "Merging ten exposures of 1 s into a single exposure of 1 s will yield less noise than a single exposure of 1 s. Mathematically, that’s averaging image data and random image noise will be reduced."