I shoot a lot of shots because I enjoy shooting. While the 1 arrow theory is sound as it simulates the conditions of a hunt, I simply don't feel that 1 shot per session is enough to keep good form. Form is based upon repetition and muscle memory. This cannot be developed and maintained with one shot per day, in my humble opinion.
I do, however, place heavy emphasis on that first shot. If that first shot is a miss, what corrections in form need to be made to put the arrow in its proper place on target? I had a wrestling coach in college that used to say "practice doesn't make perfect, perfect practice makes perfect." I have missed more than my share of game animals. In that moment of disappointment I have never once wished that I had practiced less. Food for thought.
Jake