I don't see how the rings would hit the ridge when everything else is the same. BUT, you need to get rid of the ridge so you can remove the pistons without harming them. That's my take anyway. I am not a machinist by any means.
Because the new rings will have a sharper edge than the worn ones that formed the ridge, that can result in cracked rings, or a pushed top ring land pinching the 2nd ring.
