> but the issue of things not lining up is primarily one of using coordinate systems correctly, knowing what things were measure in and what they are shown in
Not in my experience. Two satellite/plane pictures from the same provider can be shifted by several meters. Buildings hand-drawn in OSM are rarely perfectly correct, and won't fit most images anyway due to the first point.
Conversions between coordinate systems are precise up to floating-point errors, that's the easy part and more or less solved by geo-referenced data formats.
Not in my experience. Two satellite/plane pictures from the same provider can be shifted by several meters. Buildings hand-drawn in OSM are rarely perfectly correct, and won't fit most images anyway due to the first point.
Conversions between coordinate systems are precise up to floating-point errors, that's the easy part and more or less solved by geo-referenced data formats.