If you're doing serious target shooting then you'd be amazed at how much difference little things can make. If you're hunting or paper shooting in preparation for hunting, you'd be amazed at how little the small things will help
If you don't feel you're getting a clean release from your string then look at your nocks, but if you have no reason to believe that there is a problem then concentrate on the things that will make a huge difference.
Things like being able to hold your string at your anchor for 30-60 seconds, being able to get a quick and accurate shot off, being able to pull an arrow from your quiver quietly, being able to nock an arrow or work your release when you're hands are frozen, being able to stay accurate and patient when your heart is pounding out the 1812 overture, etc.