My fiancee and I have both agreed not to wear wedding rings, or wear something extremely strong like the newer tungsten rings (neither of us care for gold). We both work with our hands a lot... I do electronics and repair as a hobby, she likes to fix her own cars and she's been through part of diesel mechanic school. We both realize it'd be too easy to leave a ring on and ruin it (and perhaps ruin or lose a finger while we're at it).
However.... were I to wear a ring every day, I'd wear it while practicing. Why? Because it would affect my grip, and anything that affects my grip wil affect my aim. If I practiced bare handed and got to where POA was instinctual, and SHTF at home and I was wearing a ring, how disappointed would I be that I missed because my trigger contact point changed?
That's a drastic comparison, but the point is valid...