The obsolete area forecast winds covered a large area. If one were planning a long trip it was easy. Just pick the wind at your intended level and use that for planning. The wind would possibly cover the entire route. The small grids on the new forecast have frequent wind changes. The chart is small with no place names so a track line is a bit of a guess.
EFBs will do the work for you but how does one plan a flight through multiple grids? How would a student cope with planning a long nav on a nav computer? What are instructors teaching?