See and avoid
Interesting to read David Robert's encounters with a ?Cessna and a Tornado.
Too right the Cessnas (and my Supercub) have blind spots. So does a Warrior; in the USA I was traveling at the correct altitude for my direction (slightly to the right of north) and only just in time when his airplane blossomed from behind my doorpost, saw the opposition. He never saw me, it would have spoiled his entire day.
In the glider one has (except in a K-7) superb visibility, except below under the nose, and when the Cessna is catching you up from behind. Also in the glider one spends a lot of time going around in circles.
Also our training (and survival instinct) insists on lookout.
As far as right of way, forget it. We assume the spam can driver has got his head inside. If only the military pilots ethic could be transmitted to the GA fraternity. . . . .