What are the major unresolved scientific questions about Oumuamua and similar objects?

From my years parsing light curves of small bodies, the big open questions are: is Oumuamua’s non-gravitational acceleration best explained by outgassing, radiation pressure on an ultra-thin object, or something else? If outgassing, we should have seen a coma; deep searches found nothing substantial, which pushes us to tighten activity limits. If radiation pressure drives it, that implies very low density and an unusually thin geometry, raising questions about formation and survival. Then there’s shape and rotation: is it a highly elongated fragment with a stable spin or chaotic tumbling, and what does that mean for its past stellar encounter? How common are interstellar visitors, and how will LSST and other surveys reveal their true rate and diversity? I’d stay skeptical of exotic explanations and rely on measurable constraints.

From my years analyzing interstellar objects, non-gravitational acceleration origin, extreme elongation, and interstellar visitor rates remain unresolved.