Can i just point out the reason we go down final app with power on is not to offset the effect of drag in fact the opposite is true the drag is to offset the thrust.
Reason for this is jet engines require time to come up to power, if you do not have them stablised the response time in the event of a go around(Idle thrust to go around power in the event of a "glide app") would be unacceptable at least with decision heights that are normal/required for all wx airline transport ops.
Todders