Not just your opinion Potnoodle. It isn't a matter of neurophysiology. Shooting a bow seems really simple, but we all now that the kind of fine, repeatable control necessary is not easy at all, and it seems impossible to keep in our conscious mind everything we should be doing while shooting an arrow. Every nerve is wrapped with myelin, which serves as an insulator. There are cells around the nerve cells which respond to the nerve being fired by wrapping it in more myelin. The result is that the more a particular nervous pathway is used, the stronger and faster the signal down it, compared with other pathways that may do the same sort of action in a slightly different way. Skill development means wrapping the right neural circuits with lots of myelin. When you stop thinking about it and just let your unconscious 'take over' it is these well-used pathways that will fire. Now you can see that if you do an action in a slightly different way each time, myelin gets wrapped around a number of neural circuits, and none of them become dominant. The result is it is pot-luck which pathway gets fired when you don't think about it (ie exactly how your muscles get excited to carry out the action).
But there is a bootstrapping problem. You want to make sure that you do only 'good' shots so that only the nerves involved in exactly the actions of a good shot get reinforced, but you can't think about it all consciously at once, it is too much, so you can't just do 'good' shots from the start. This is why the task is broken down as mentioned above. Do one thing, like raising the bow, lots of times, and because it is a very simple action you can concentrate on doing it right. Every time you do it, that way of doing it is reinforced. Now you can move on to the next bit of the action, forgeting about the first because the unconscious will now do that automatically the way you have trained your nervous system. Get the idea?
Also, warmups are of dubious benefit to archers, in my opinion, but if you choose to do one make sure it is a warmup and not a stretch. Stretching before exercise is a bad idea, as it decreases strength in the stretched muscles by up to 30% for up to 1/2h afterwards, which is not what you want. By all means stretch after exercising.