The swivel between the and spoon keeps the fish from using the split ring as a perch which he can use a fulcrum to pry the hook from its mouth.
I only use Ball bearing swivels on my favorite lures and barrel swivels on others.
I use a a snap ball bearing swivel on the end of my leader. This allows me to change lures swiftly.
I also have a ball bearing swivel on the end of my main line to which I hook the leader.
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I fish, ergo, I am.

If you must burn our flag, Please! wrap yourself in it.
Puget Sound Anglers, So. King Co.
CCA SeaTac Chapter

I love my country but fear my government