I know that address data is hardly usable in large parts of the OSM world. What iOS app are you using for 'accessing' OSM? From https://wiki.openstreetmap.org/wiki/Comparison_of_iOS_applic... I suggest https://organicmaps.app/
Often it's a long stretch until the map is 'fully usable', but that's the thing when you try to avoid Google (which is my use-case).
And - as I live in Central Europe - OSM is very well usable for me any my use-case.