@Tom-Grzelinski, No, the white arrows are ON the routeline, and indicate the first upcomming direction change.
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The blue routeline here is red due to traffic info by the way.
I can confirm that the arrow grows with line thickness, something you could have tried for yourself as easily as I have just done. You don't need to live on MRA app for that (neither do I).
At roundabouts there is a white arrow to enter the roundabout, and a new one only when you leave it. Like mentioned above, of course I would encourage, specifically for roundabouts, that the arrow shows the entry as well as the exit together. I don't know if that's possible though.
The small black arrows only indicate the direction of the route, and yeah, of it overlaps they point to eachother.