According to our MSL instructors does this in particular apply on right-handed people... (vice versa for the left-handed)... probably some conjunction with (right hand) counter-steering and positioning of the head while looking far into a left turn/bend... can any left-handed people out there dis/confirm?
Left/Right handed is the easy answer, but I don't believe you'll find many experienced instructors who believe it's correct. I've trained close to 6000 people, and several dozen instructors, across several levels of curricula over the years, and I find this not to be the case. Most of the students, who are comfortable in either direction, are right handed - statistically it has little to nothing to do with it. From student discussion on the topic, the most prolific and consistent observation has been that it is a matter of confidence directly related to maintaining steady throttle operation, which most find more difficult when leaning right due to the angle of their wrist, while maintain smooth pressure on that grip to control the lean angle. The right hand is doing double duty from a less natural position. I know from practicing demos for advanced courses, and track time that this is the one thing I have to work on the most to get good symmetry in my corners.
Another common, yet questionable element, is lane orientation. A lot of riders in right lane countries will correlate comfort with lefts having to do with the extended sight line to the left - makes sense. Yet, those who drive on the left side of the road, the significant majority are also more comfortable to the left and attribute that to the positive road camber of the crown - also makes sense, but they seem to contradict each other.
