Let us create holy sites for unreformed faiths.
The process of reforming a faith should make you have to create holy sites instead of for example, making Norse conquer some random tree (pole?) in paderborn. Hopefully that’s the direction that they’re going in with the new system that highlights special event locations, maybe it could give an event or decision to make a special area a holy site after some time has passed or we could even tie it in with the legends system. some more obvious ones that where holy sites before the game starts could already be established holy sites of course, but the ones that became special later, and the more subjective holy sites, should be more dynamic as you play.