BookBarbarian
Expert Long Rester
Funny, because the competition shooters I know all say to draw and release as soon as the draw is complete: don't hold. Basically for exactly the reason you say.
There's a mildly amusing anecdote about someone who took a bow around to someone's house for some kind of demonstration, and their muscle memory was such that they accidentally fired an arrow through suburbia while demonstrating a draw.
This is true. it a lot of time to learn how to do it well though. I guess that's represented with proficiency bonus.