Everything I can see you saying -- much if it agreeable, like the fact that long-exposure OIS makes a lot of what this technology currently does possible without it -- is simply handwaving away the fact that EIS-over-burst with OIS can achieve things that OIS cannot by itself.

It seems to me that it's patently true that EIS has some benefits, and those benefits can be realised over the top of OIS.

There's obviously still a fair limit to OIS. I have somewhat shaky hands and even using something like Olympus' top range 5-axis IBIS, which is the best I've ever seen, I can still only shoot at 1/10". What can EIS do with a burst of 3x 1/20" exposures? Probably counter for my shaking a bit, at least. (If not for subject movement, yet.)

I simply do not see why you're discounting this so heavily.

If you stack the original exposures together, you'll get ghosting and not a blur. The natural-looking blur is a result of computation.

> of course stacked photo frames are underexposed, wouldn't make sense otherwise

Except it does make sense if you want to capture more shadow detail, this is how HDR images are made.

You're severely underestimating the amount of computation involved in getting these shots. These are all handheld, and as @dgacmu mentions can benefit from exposure bracketing which gives much better results than a single long exposure.

Of course you could already get similar shots from a good camera and technique - the fact these are handheld shots coming from a mobile device, and straight out with the camera is the impressive part.