"I know everyone misses but how do we train for that ONE SHOT"
One way is to be familiar with the basics of good form, which are not complicated. The next way is to use an uncomplicated shooting style. That doesn't mean to practice undisciplined shooting. It means keeping your approach as simple as you can while staying within basic form.
Hunting and target shooting are quite different with regard to their goals. For the latter the goal is precision shooting for competitive entertainment, usually under controlled conditions. A fussy, methodical approach can work well. When hunting you are trying to humanely take the life of an animal that you highly respect, yet feel an instinctive urge to successfully kill and consume, all under unforeseen and ever-changing circumstances of distance, weather, shot angle and readiness. Not the same thing at all.
The predatory rushes and pressures of a hunting situation, and even that tiny lurking instant of subconcious regret, are easier to control and perform effectively if there is no mechanical assistance or 'calculating' needed to direct the arrow to it's purpose. And I might add, it makes success much sweeter/more rewarding.