shoulder girdle flexibility

I know this is a stupid question that I don't know the answer to.

What does having a flexible shoulder girdle enable you to do what someone with an unflexible shoulder girdle would not be able to do?

I am pretty much asking what is a flexible shoulder girdle useful for?

thank you

Better turning skills in swings and handstand pirouettes. Better tumbling, possibly healthier ROM because of not being restricted by flexibility.