Thank you for your reply!
I just realised, that WITHOUT changing the orientation of the dimensions (standard sketching default), the viewing cube ALSO has questionable (=weird) name labels ... in other words, the "weirdness" does not change with the re-orientation of the axes.
You are , of course right, that these are "only" labels. The main thing is the correct orientation of the axes.
And yes, the label could be defined by the side you are looking at (which is, by the way, the same side you are looking FROM, let's call it Rule 1), let us say LEFT in an Example A, OR by the direction you have to direct your glance in order to see that side, which would then be RIGHT (Rule 2).
HOWEVER that would then need to be consistently applied. When you are looking at the front of something that would then be "BACK" with Rule 2, which is not what happens in the viewing cube nomenclature. So from my point of view, any "naming rule" that may have been devised was not consistently applied to the viewing cube.

If "RIGHT" were to be correct, then TOP would need to be BOTTOM and FRONT needed to be BACK.