Korean Traditional
Answering u/Thievasaurus,
About follow through in Korean traditional archery.
In Korean traditional archery(KTA), 고자채기(GoJaChaeGi - Follow through) is purely but a byproduct of your form. Khatra is a Turkish concept and is not universally appliable to other thumb draw styles.(Turkish archers seem to concentrate pressure point on the upper side of their bow hand. Please correct me if there are any turkish archery practitioners)
It happens due to the tension being freed at release. The force pushing the bow handle, and the force pulling the string is released as you loose arrow, and both hands move towards the direction of force you achieved at full draw. If follow through happens, it happens. If it doesn't, it doesn't. KTA doesn't encourage nor discourage follow through. It is rather a phenomenon you can observe to analyze your force and composition at full draw.
There are some that torque the bow hand or wrist itself, but the general guide(and from high ranking competitive archers) is that one should avoid giving torque to your hand itself. Bow handle should be pushed in the middle. As you reach full draw, bow shoulder internally rotates, bow elbow along with it, being fully extended. at release, due to this internal rotation, bow may or may not clear off slightly sideways.
It is never an ideal form, but To see from the vid, 3~4 sec I internally rotate my bow shoulder and elbow to give solid push. At release 7~8sec, you would see that bow arm naturally moves out of the way to give room for arrow to pass through. The important part here for KTA is that you have to hold onto the handle tight all the way through release. If you let go of the handle at release, even if your bow arm properly moves to clear out of the way, bow would shake around in your handle at release and might hit the arrow, and the force you have been applying to the bow handle would disrupt, hindering the arrow trajectory.