Thanks for all the insight.

You probably know the "drivers watches" from the seventies, which had the display at the side of the watch that faces towards you when holding a steering wheel (search for "Bulova driver's watch"). I think it would be great to get something similar again for smartwatches. A small display at the side of the watch, showing the time or some indicators. This display would be visible without rotating the wrist and make it much easier to get status information.

In addition there would still be the large display on top. Combined screen size would be even bigger without increasing the size of the watch.