RE: Analyzing the miss...
For the most part I think this is a very good way to shoot. The only comment I would make is that for beginners, repetition (as long as its correct repetition) probably would help more than single shot practice. Once the basic form and muscle memory is down part, a “seasoned” shooter can probably eke out more from single shot practice.
On a separate but related topic, I think analyzing the miss when it occurs on a real animal is HIGHLY overlooked in bowhunting. Too many people attribute missing to just being part of the game, but I think that given just a little bit more effort, one can reduce their misses on game down to very low levels.