I have to correct myself. In the meantime, with the final 1.29 release, the draw distance for "far" objects seem to be shortened to around 1480 meter. I just did some measurements in the map editor. No other mods in the mod folder than the bare minimum to test this.
EDIT: I did some more testing, because I thought some higher precision couldn't hurt. Now I worked with absolutely straight roads and and XY aligned nodes, to have a better judgement than a mere approximation. I should now be able to have it down to, say, 5 meter.
Result: it is even worse than I thought: around 1420 meter for any object set "far". I'think I've seen something around 1600 meter, in the past, for ETS 2, a good while ago. Now with ETS 2 1.28 it is the same: around 1420 meter. Am I dreaming that I remember something better before the final release of 1.29?