I know a lot of women who don't always wear their wedding rings because they have other rings that are pretty fancy. They also wear some pretty big blingy rings on their left middle or index fingers that clash with their wedding rings as far as fit, color, size.
Jewelry is jewelry.
I know women who haven't taken their rings off in 50 years other than to have them cleaned or repaired. I know women whose rings are so expensive they keep them in a safe instead of wearing them on vacation so they won't get lost or stolen.
I'm not sure it has anything to do with "customs". Just personal preferences.
Not sure what churches you might be talking about, but Jewish people traditionally get married with their rings on the right hand. Some move them to the left hand later on, but not always.
No offense, but I'm not sure what difference it makes. Some married people don't wear rings at all. I've been divorced for 15 years and I wear rings on my "wedding ring" finger all the time. Some of my favorites are ones my son gets me from gumball machines. Yes, I have worn them in public.
I'm not sure there's a "wrong" finger when it comes to bling.
Just my opinion.