Maurus
The Great Gazoo
I'm probably over-thinking this, but have yet to see any LOI on the subject (other than those presented earlier).
There is no LOI on this, hence the reason it has gone in circles. Realistically there is no reg requiring the logging of landings other than for passenger currency. It seriously comes down to preference. I log all landings to form a more complete overview of the lessons I conduct with my students.