Diversions
Whopity
Agree absolutely! Heading and time is the key for they are the only measures of value once airborne.
Choosing the simplist to identify and least ambigous feature at whatever point along the track is paramount. Doubling the track error dosn't have to lead directly to the turning point/destination. Doubling the error prior to halfway will also bring you back onto the planned track when a revised heading should be used to the next planned point. If the fix is more than half way then treble the error which will return you to track/destination in half the distance and time.
A halfway mark in ther middle of nowhere is pointless though continues to be taught in some places for some mystifying reason.