What I struggle with - isn't even let's say walking around, small air movements etc. producing enough tremor to influence this? We're talking about moving the sensor/scene by one half of a pixel size which is a miniscule amount (2 micrometers or so).

Yes, hence tripod and photographing buildings, as mentioned in an ancestor comment[1]. On a windy day (enough to shake the tripod) or on shaky ground (cars, trams) I guess this might still not be enough.

[1]: https://news.ycombinator.com/item?id=41333736

I do not but as I mentioned in my previous post the camera supports a shutter delay (to account for the movement of pressing the button), which I used for this mode.

I feel like I really did everything I could to create the ideal conditions for this mode to produce good results, and it simply didn't.

That said, all this talk has made me want to go try again.. :-)