Caking yarn. Thoughts?

I've read that caking yarn that won't be used for a while stretches it out. In your experience, is this true? Or is it fine and don't worry about it? I don't sell anything, I just crochet as a hobby and I love winding my yarn with my little manual yarn winder. It makes storage easier and takes up less space. Is it really that big of a deal? My winder isn't very big so it's usually half cake half hand winding into a ball lol.