The only ones that didn’t seal on me is when I followed the “just put it in the jar” suggestions. Some sealed, some didn’t. I still like jars over bags I’ve received from other members in trades. I just mention this because there is no 100% foolproof method.
yes, I remove the rings on all jars, jams, sauces, beans, salsa, etc... If you’ve ever had a can of waterbathed low-acid beans or sauce bubble out in the back of a pantry, taking the rings off is the best way to keep an eye on things, before they stink up the kitchen.