Rico....yes there is. And, there is a lot more to accuracy than one shot groups 8^). Whatever works for you doesn't always work for someone else. However, to say that shooting groups will not help is a little far-fetched.
Most of my practice is just stump shooting, but if I start getting some lousy shots, I revisit my grouping ability; if nothing more, than to establish I didn't have a form let-down. We aren't talking about compound bow shooters, we are talking about any archer. The best bowhunters I know have attended NFAA shoots over the years and worked on their groups.
In any event, working on groups will not detract from one's hunting skills....unless one is a complete disaster in their form. Hunting skills and shooting skills are earned in different ways, and come together through practice in both.
I can shoot both groups and one-arrow hunting shots with no problems, and one compliments the other.