Each to their own. I have several snap swivels in my kit and I have used the for other things than fishing!

I make sure I "use" my emergency fishing kit several times a year to keep in practice. I've made a number of changes in my kit based on what I've experienced in the practice sessions.
I've also used many of the item in my kit to build traps and snares for small animals and birds. A somewhat wise old ex "Coastie" puddle pirate once reminded me Perfect Practice Prevents P*ss Poor Performance.
How does one know their gear is in good shape and will work if you don't practice.

BTW, SUE
The pointy end of the hooks go in the fish, not in you!