Not quit right.
the 60-70% heart rate rides burn a high percentage of fat.
the 70-80% rides burn a lower percentage of fat at a higher rate.
To me, the 60-70% rides are for people trying to lose the most fat for the least effort. Its the most 'effort efficient' type ride.
The 70+ rides are for burning the most calories, and therefore the most fat, in the least time. They are the most 'time efficient' type rides.
I dont know anyone who can afford to exercise for 4+ hours a day in order to go the least effort route, everyone I know has time as the limiting factor, and they want the most benefit from the 1 or 2 hours a day they choose to invest. (times just used for comparasons)
Higher intensity means less fat efficient burn, but burning more overall. Just dont start by trying to ride at 80+ but build a base first.
The higher intensity ride also has the potential to raise your metabolism higher so you burn more in your mentioned recovery, but thats hardely worth mentioning