PLAN ACCURATELY
FLY ACCURATELY
THINK AHEAD
UAV689, what you describe is thoroughly gash and unprofessional. Neither is it 'Dead Reckoning'.
Glider pilots, incidentally, are unlikely to maintain a precise track due to the availability of lift, so your comparison is invalid.
All my UAS students were able to plan accurately - are things really so dumbed-down nowadays?
Failure to complete proper planning is not 'over the top' - it is pure laziness.