I think that isolating what you need to work on so you can focus on it without being distracted by other things is a great idea. If drawing and holding without releasing helps you to do that, then it is a worthwhile thing to do.
In my case, the thing I need to work on is releasing the arrow only when I am ready, and not before. I haven't figured out how to work on that without actually releasing the arrow. I can hold until my arms wear out if I know I’m not going shoot! 🤪