Interstellar objects offer remarkable insight into processes across the Galaxy — from dynamics in the Milky Way potential to snapshots of the protoplanetary disk chemistry of stars that no longer exist. Our Ōtautahi-Oxford model is a new effort to account for this wide range of physics, providing a holistic picture of interstellar object formation and population development. I will describe our resulting predictions for the sample of interstellar objects that future sky surveys will detect in the Solar System’s observable volume, particularly LSST.